which power supply feature helps prevent circuit overloads by balancing the current flow
Answers
A power supply feature that helps prevent circuit overloads by balancing the current flow is the over-current protection (OCP) feature.
What is a power supply? A power supply is a device that transforms electrical energy from a source into electrical energy that can be used to power electronic devices. A power supply converts the power from a wall socket or other power source into a form that is compatible with the device it is powering. Power supplies come in a variety of shapes and sizes, from small wall adapters that power cell phones to large rack-mounted power supplies that power computer systems.
What is over-current protection (OCP)? When a power supply provides power to a device, it must deliver the correct amount of current. Too little current, and the device will not function correctly; too much current, and the device may be damaged or destroyed. Over-current protection (OCP) is a power supply feature that helps prevent circuit overloads by balancing the current flow. The over-current protection feature monitors the current flow in the circuit. If the current exceeds a certain threshold, the OCP feature will shut down the power supply to prevent damage to the device. OCP is an essential feature in power supplies that are used in critical applications such as medical equipment, industrial automation, and military applications. OCP is typically implemented using a current sense circuit that measures the current flowing through the circuit. The current sense circuit feeds this information back to the power supply controller, which then adjusts the current output to keep it within safe limits.
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Related Questions
true reversing controllers contain two separate contactors and _____ overload relay(s).
Answers
True reversing controllers contain two separate contactors and 2 overload relays.
What are reversing controllers?Reversing controllers are equipment designed to enable bidirectional rotation of a motor. These devices find common application in scenarios where the motor necessitates the ability to move a load in both forward and reverse directions, such as conveyors, hoists, and winches.
True reversing controllers are equipped with a pair of distinct contactors and two overload relays. This arrangement is imperative since each rotational direction mandates its dedicated contactor and overload relay to safeguard the motor against excessive heat generation.
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Water is heated by hot air in a double-pipe heat exchanger L = 10 m, with water flowing in the inner tube (Di = 3 cm), and air flowing in the tube annulus (Do = 5.5 cm). The flow rate of the water is 1.2 kg/s and that of the air is 0.5 kg/s. The water enters at 40°C while the air enters at 280°C. If the air-side convection coefficient hair = 1000 W/m2·K, determine the following:
(a) The outlet temperatures of both the air and the water if the heat exchanger is operating in a parallel-flow arrangement.
(b) The outlet temperatures of both the air and the water if the heat exchanger is operating in a counter-flow arrangement.
Assume fully-developed flow conditions. Evaluate the fluid properties at the inlet temperatures.
Answers
(a) In a parallel-flow arrangement, the outlet temperature of the water and the air can be determined using the energy balance equation. The heat transfer rate between the water and the air is equal to the product of the water mass flow rate, specific heat capacity of water, and the change in temperature of the water:
Similarly, the heat transfer rate between the air and the water is equal to the product of the air mass flow rate, specific heat capacity of air, and the change in temperature of the air:
Since the heat exchanger is operating under fully-developed flow conditions, the outlet temperature of the water and the air can be found by equating the heat transfer rates:
By substituting the given values, including the specific heat capacities of water and air, and solving the equations, the outlet temperatures of the air and water can be calculated.
(b) In a counter-flow arrangement, the outlet temperatures of the air and water can be determined using a similar energy balance equation. However, in this case, the change in temperature of the air is taken as the difference between the outlet and inlet temperatures of the air:
Again, by equating the heat transfer rates, substituting the given values, and solving the equations, the outlet temperatures of the air and water in a counter-flow arrangement can be calculated.
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If two hot-air balloons are filled at the same time, but one is filled with warm air and one is filled with hot air, which
balloon do you think will rise higher?
The balloon with hot air
The balloon with warm air
Answers
Answer:
the hot air balloon
Explanation:
Warmer air is less dense than cooler air, so it rises faster compared to a cooler hot air ballon.
The balloon filled with hot air will rise higher because of its lesser density.
What is meant by density ?Density of an object is defined as the mass per unit volume of the object. It is considered as the measure of amount of substance in a give space.
Here,
Two hot-air balloons are filled at the same time. Among them, one is filled with warm air and the other one is filled with hot air.
When the balloons are released to go up, the balloon filled with hot air will rise higher. This is because of the difference in their density.
When the hot air is filled, its temperature is increased. Therefore the volume also increases which will result in the decreased density of the hot air balloon.
The balloon filled with hot air will be less denser when compared to the other. The buoyancy of the balloons is affected by their densities.
The hot air in the balloon is less denser than the cool air. So, the buoyancy of the hot air balloon will be more than that with warm air. As a result, the balloon filled with hot air will rise higher in the air.
Hence,
The balloon filled with hot air will rise higher because of its lesser density.
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a car is moving at 30.0 km/h when it accelerates at 2.0 m/s for 3.6 s. what is the car final speed?
Answers
Answer:
wrong question
Explanation:
unit of acceleration is written in m/s which is wrong
The final velocity of the car which is moving with the initial velocity of 30km/h is 15.53m/s.
What is Acceleration?Acceleration of an object is the rate of change in the velocity of an object. It depends upon the initial and final velocity of an object. It is a vector quantity because it has both magnitude and direction. The SI unit of acceleration is meter per second square.
a = (v-u)/ t
v = u + at
u = 30 × 1000/ 3600 = 8.33m/s
a = 2.0m/s²
t = 3.6 seconds
v = u + at
v = 8.33 + 2.0 × 3.6
v = 8.33 + 7.2
v = 15.53m/s
Therefore, the final velocity of the car is 15.53m/s.
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Avatar 1 movie
So number 5 was How do the Na'vi communicate over great distances or between lots of other Na'vi ?
And number 6 was If Pandora is a bit smaller than the Earth and spins around somewhat the same , why might it be that it spends days at a time in darkness ?
Answers
The Na'vi can communicate over great distances or between many by means of messages that they emit through the earth, the goddess Eywa. Additionally, if F spends days in the dark because she rotates around the earth so in some phases of her rotation the earth covers the sunlight during the day.
How do the Na'vi communicate?To know how the Na'vi communicate, we must watch the Avatar movie to find out the answer. In this case, the indigenous people of Avatar use different forms of communication such as oral or intercom radios that are on their necks. However, the most conventional way is to use Eywa to send messages over long distances.
Why are there dark days on Pandora?The dark days on Pandora are due to the fact that this planet rotates around the earth, so on some days, the earth covers the sunlight during the day.
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As the train in the image moves to the right, which person hears the train horn at a lower pitch?
Answers
Answer:
Answer: Explanation: Person A's velocity relative to the train is 0. Therefore, the pitch of the horn will not change.
Explanation:
The person who hears the train horn at a lower pitch is A.
What is pitch?Pitch of any sound wave is directly proportional to the frequency. The higher frequency instruments have higher pitch.
As the train in the image (attached) moves to the right, Person A and B are sitting in the train. Person C and D are standing outside the train.
Person A's velocity relative to the train is 0. So, the pitch of the horn will not change.
Therefore, the person A will hear the train at lower pitch.
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Which main heavenly bodies make up the solar system?
Answers
Answer:
I didn't write this I used caktus AI
Explanation:
The main heavenly bodies that make up the solar system are:
1. Sun - the star at the center of the solar system, around which all the planets orbit.
2. Planets - there are eight planets in the solar system in order from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
3. Dwarf planets - smaller celestial bodies, similar to planets but not large enough to have cleared their orbital region of other debris. The solar system has five recognized dwarf planets: Ceres, Pluto, Haumea, Makemake, and Eris.
4. Moons - natural satellites that orbit planets and dwarf planets.
5. Asteroids - small, rocky bodies that orbit the Sun in the asteroid belt between Mars and Jupiter.
6. Comets - icy bodies that originate from the outer solar system and travel in long elliptical orbits around the Sun.
7. Kuiper Belt Objects (KBOs) - similar to asteroids, these small bodies are found beyond the orbit of Neptune in the Kuiper Belt.
8. Oort Cloud Objects - these are believed to be icy bodies located far beyond the Kuiper Belt in the outer reaches of the solar system.
The S.I. unit of E is NC^-1 and that of B is NA^-1 m^-1, then unit of E/B is
Answers
The S.I. unit of E is NC^-1 and that of B is NA^-1 m^-1, then unit of E/B is A m/C (ampere meter per coulomb). This unit represents the ratio between the electric field and the magnetic field, indicating the strength and direction of the electromagnetic field.
The SI unit of electric field (E) is NC^(-1) (newton per coulomb) and the SI unit of magnetic field (B) is NA^(-1) m^(-1) (tesla). To determine the unit of E/B, we need to divide the unit of E by the unit of B.
Dividing the unit of E (NC^(-1)) by the unit of B (NA^(-1) m^(-1)), we can simplify the expression:
E/B = (NC^(-1))/(NA^(-1) m^(-1))
To simplify this expression, we can cancel out the common units in the numerator and denominator:
E/B = (N/C)/(N/(A m))
Now, let's simplify further by dividing the numerator and denominator:
E/B = (N/C) * (A m/N)
Canceling out the common units:
E/B = (A m)/(C)
Therefore, the unit of E/B is A m/C (ampere meter per coulomb).
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If the mass of an object is 100 and Net force is 400, what would be the Acceleration?
And explain.
Answers
Answer:
\(4m/s^{2}\)
Explanation:
I'm assuming the units for force and mass are Newtons and kilograms, respectively.
Rearranging Newton's first law (F=m*a) to solve for acceleration:
F=m*a
\(a=\frac{F}{m}=\frac{400 N}{100 kg}=4m/s^{2}\)
The acceleration is 4 meters per second squared and was found by rearranging Newton's first law in order to solve for acceleration.
Which of the following best describes the relationship between frequency and wavelength of electromagnetic waves?
a
b
If the frequency remains constant, the wavelength increases.
The wavelength decreases as the frequency decreases.
The frequency increases as the wavelength decreases.
If the wavelength remains constant, the frequency increases.
С
d
Answers
Answer:
The option that best describes the relationship between frequency and wavelength of electromagnetic waves is the third option
c. The frequency increases as the wavelength decreases
Explanation:
The frequency of an electromagnetic wave, 'f', is given by the following formula;
\(Frequency, \, f = \dfrac{Wave \ Speed,v }{Wavelength, \ \lambda}\)
From the above formula, the frequency of an electromagnetic wave is inversely proportional to the wavelength, and therefore, a higher frequency, ('f', to increase), requires a lower wavelength, (λ, decreases)
The correct option is that the frequency of an electromagnetic increases as the wavelength of the wave decrease.
Light is one form of energy that travels in electromagnetic waves. This energy is both (1)
and
electrical. There are many different types of electromagnetic (EM) waves. Most of them cannot be seen by humans.
Our eyes see only a small (2)
of EM waves called visible light Visible light is made up of different colors
The colors are red, orange, yellow, green, blue, indigo, and violet. The colors are due to the different (3)
of
light. The (4)
the wavelength, the less energy the wave has. The shorter the wavelength, the more energy
it has. The (5) wavelength of visible light looks red to us the shortest (6)
of visible light looks
vlolet to us
Answers
Answer:
Explanation:
Electromagnetic waves are formed by the interference of both electric and magnetic fields. These include: Microwaves, Radio waves, Infrared, Visible, Ultraviolet, X-ray, and gamma rays. These waves can be arranged in a specific order (called spectrum) with respect to their wavelength or frequency. The higher the wavelength, the lower the frequency. And vice versa.
These waves are transverse, and travels at the same speed (speed of light - 3.0 x \(10^{8}\) m/s).
In the given question, the answers are:
1 - Magnetic
2 - Region
3 - Refractive indices
4 - Greater
5 - Higher
6 - Wavelength
A solenoid with a length of 6.5 cm and 200 loops is carrying 5 A of current. What is the
strength of the magnetic field at the center of the solenoid? Label the north and south pole of
the solenoid.
Answers
The strength of the magnetic field at the center of the solenoid is 0.006 T
Magnetic field calculation.
The strength of the magnetic field at the center of a solenoid is given by:
B = μ₀ * n * I
where B is the magnetic field strength, μ₀ is the permeability of free space, n is the number of turns per unit length of the solenoid, and I is the current flowing through the solenoid.
In this case, the length of the solenoid is not given, but we can assume that it is much greater than the diameter of the solenoid, so we can treat it as a long solenoid. The number of turns per unit length is given as 200 loops divided by the length of 6.5 cm, or:
n = 200 / 0.065 m = 3076.92 turns/m
The current flowing through the solenoid is 5 A.
The permeability of free space, μ₀, is a constant with a value of 4π x 10^-7 T m/A.
Therefore, the magnetic field strength at the center of the solenoid is:
B = μ₀ * n * I
= 4π x 10^-7 T m/A * 3076.92 turns/m * 5 A
= 0.006 T
So the strength of the magnetic field at the center of the solenoid is 0.006 T. The north pole of the solenoid is the end from which the magnetic field emerges, and the south pole is the end where it enters.
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What is the electric potential energy of a charge that experiences a force of 3. 6 × 10–4 N when it is 9. 8 × 10–5 m from the source of the electric field? 3. 5 × 10–8 J 4. 6 × 10–4 J 2. 7 × 10–1 J 3. 7 × 100 J.
Answers
The electric potential energy of the charge will be =3.5*10^8 J
What is Electric potential energy?Electric potential energy is the energy that is needed to move a charge against an electric field.
F=Force experienced by the charge = 3.6*10^-4 N
q1 = magnitude of charge producing the electric field
q2 = magnitude of charge experiencing the electric force
r1 = distance between the two charges
Electric force experienced by the charge is given using coulomb's law as
\(F=\dfrac{kq_1q_2}{r^2}\)
\(3.6\times 10^{-4}=\dfrac{9\times 10^9 q_1q_2}{(9.8\times 10^{-5})^2}\)
\(q_1q_2=3.84\times 10^{-22}\)
Electric potential energy of the charge can be given as
\(U=\dfrac{kq_1q_2}{r}\)
\(U=\dfrac{(9\times 10^9)q_1q_2}{(9.8\times 10^{-5})^2}\)
\(U=3.5\times 10^{-8}\ J\)
Thus Electric potential energy of the charge can be given as \(U=3.5\times 10^{-8}\ J\)
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PLSS HELP NOWW!!!!!!(01.01 LC) Which is an example of the force of attraction between two objects that have mass? (2 points) a Magnetism b Gravity c Solar energy d Electricity
Answers
Answer:
pretty sure it is gravity
Answer:
Electricity
Explanation:
An electron travels here at a uniform velocity of 1. 3 x 10^5 m/s. How much time is required for a displacement of 1. 00 m?
Answers
the time required for a displacement of 1.00 m for an electron traveling at a uniform velocity of 1.3 x \(10^{5}\) m/s is approximately 7.69 x \(10^{-7}\)seconds.
To find the time required for a displacement of 1.00 m, we can use the formula:
time = displacement ÷ velocity
Substituting the values, we have:
time = 1.00 m ÷ 1.3 x \(10^{5}\) m/s
time = 7.69 x \(10^{-7}\) seconds
this calculation demonstrates the extremely short time scales involved in the motion of electrons, which can move extremely quickly due to their small size and mass.
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the manufacturer of a 12 v car headlight specifies it will draw a current of 6 a. you would like to check this claim with an ammeter designed to measure currents up to 10 a and having a resistance of 0.1 ohms. a. which of the two circuits in the attached figure represents a circuit where the ammeter correctly measures the current in the headlight? b) How much current (in A) would flow in the ammeter forCircuit a? c) How much current (in A) flows through the ammeter for Circuitb?
Answers
a) Circuit b represents a circuit where the ammeter correctly measures the current in the headlight.
b) The current flowing in the ammeter for Circuit a would be 6.67 A.
c) The current flowing in the ammeter for Circuit b would be 6 A.
To ensure that the ammeter correctly measures the current in the headlight, it should be placed in series with the headlight, as shown in Circuit b.
To calculate the current flowing through the ammeter in Circuit a, we can use Ohm's Law, which states that I = V/R, where I is the current, V is the voltage, and R is the resistance. In this case, the voltage across the headlight and the ammeter is 12 V, and the resistance of the ammeter is 0.1 ohms. Therefore, the current flowing through the ammeter would be I = V/R = 12/1.8 = 6.67 A.
To calculate the current flowing through the ammeter in Circuit b, we can use the same formula. Since the ammeter and the headlight are in series, they have the same current flowing through them. Therefore, the current flowing through the ammeter would be 6 A, which is the same as the current specified by the manufacturer.
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what is regular body in physics
Answers
Answer:
The definition of a regular shape is that all the sides are equal and all the inside angles are equal. An irregular shape doesn't have equal sides or equal angles.
Explanation:
Hope this helps you
Crown me as brainliest:)
13. Who named out seventh month?
Answers
Answer:
it was the gods of war.....
Answer:
juliest and august cesar
Explanation:
The angular diameter of an object is inversely proportional to its distance from the observer.
True False
Answers
This statement is True, the angular diameter of an object is inversely proportional to its distance from the observer.
Angular diameter is a measure of the apparent size of an object in the sky as seen from a given location. It is the angular distance between two opposite points on the visible surface of the object, usually measured in degrees or arcminutes. Angular diameter can be used to describe the apparent size of both small and large objects, such as planets, stars, galaxies, and clusters.
For example, the angular diameter of the Sun as seen from Earth is approximately 0.5 degrees, while the angular diameter of the Moon is approximately 0.5 degrees. Angular diameter can also be used to measure the apparent size of large-scale structures in the Universe, such as the distance between two galaxies in a galaxy cluster. The angular diameter of a galaxy cluster is typically measured in arcminutes or arcseconds. Angular diameter is a useful measure of the size of an object since it is independent of the distance between the observer and the object.
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A blue and a green billiard ball, each with a mass of 0.15 kg, collide directly. Before the collision, the blue ball had a speed of 3 m/s while the green ball had a speed of 2 m/s. After the collision, the blue ball stays in place while the green ball continues in motion.
Answers
Answer:
.
Explanation:
Can you specify what is the question asking for
A large truck is moving at 22.0 m/s. if its momentum is 125,000 kg • meters per second, what is the truck's mass? 176 kg 2750 kg 5680 kg 11,400 kg
Answers
The mass of the large truck is determined as 5680 kg.
Mass of the truck
The mass of the truck is calculated as follows;
P = mv
where;
P is momentumm is massv is velocitym = P/v
m = 125000/22
m = 5680 kg
Thus, the mass of the large truck is determined as 5680 kg.
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Answer:
C. 5680
Explanation:
edg2023
Which object would sink in honey, which has a density of 1.4 g/cm³?
Object 1 (0.9 g/cm³)
Object 2 (1.2g /cm³)
Object 3 (0.2 g/cm³)
Object 4 (2.3 g/cm³)
Answers
Answer:
objective 4
Explanation:
i took the unit test review and the regular unit test
Object 4 with a density of 2.3 g/cm³ would sink in honey, which has a density of 1.4 g/cm³, therefore the correct option is option D.
What is density?It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
The mathematical formula for density is given below
ρ =m /v
where ρ is the density of the substance
m is the mass of the substance
v is the volume of the substance
As per the law of floatation, the objects those have less density than the honey do not sink in the honey which has a density of 1.4 g/cm³.
As per the given options, object 1 has a density of 0.9 g/cm³ which is less than the density of honey 1.4 g/cm³, therefore it would not sink in the honey. similarly, objects 2 and object, 3 have a density that is less than the density of the honey, therefore they would float instead of sinking in the honey.
The only object 4 has a density of 2.3 g/cm³ which is more than the density of honey, therefore it would sink on the honey.
Hence, the correct answer is object 4.
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which of the following electric charge doesn't exist in nature? a. 8.00 cross times 10 to the power of negative 17 end exponent c b. 4.80 cross times 10 to the power of negative 19 end exponent c c. negative 2.40 cross times 10 to the power of negative 19 end exponent space c d. negative 1.60 cross times 10 to the power of negative 18 end exponent c
Answers
The electric charge that does not exist in nature is d. - 1.60 × 10⁻¹⁸ C.
What is an electric charge?
An electric charge is a basic property of matter that results from the presence or absence of electrons. Electrons are subatomic particle that makes up atoms. They are negatively charged and have a very small mass. An atom is neutral in its electrical charge since the number of electrons and protons in its nucleus is the same.
There are two kinds of electric charge: positive and negative.
The net charge on an object is the sum of all the charges on it, and it is either positive, negative, or neutral.
What is the electric charge that does not exist in nature?
Negative 1.60 × 10⁻¹⁸ C does not exist in nature because an electric charge is quantized in nature, which means that electric charge is always a multiple of the smallest electric charge unit (charge of an electron or proton).
The electric charge on a proton is equal and opposite to the electric charge on an electron.
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a meteor is falling towards the earth. if the mass and radius of the earth are 6×10^24 kg and 6.4×10^6 m respectively, find the height of the meteor where its acceleration due to gravity is 4m/s^2 ?
Answers
Answer:
F = G M m / R^ force between m and earth where R >= radius of earth
a = F / m = G M / R^2 acceleration at radius R
am / ae = (Re / Rm)^2 acceleration of meteor to that of earth
am / ar = (4 / 9.8) = (Re / Rm)^2
Rm = (9.8 / 4)^1/2 Re
Rm = 1.56 Re = 1.56 * 6.4E106 m = 10E6
10E6 - 6.4E6 = 3.6E6 m above surface of earth
(You only need mass of earth if you are calculating a at the surface of the earth)
Calculate g = G M / R^2 = 6.67E-11 * 6E24 / 6.4E6)^2 = 9.77 m/s^2
This is close to the value we used - 9.8 m/s^2
: In the spring of 2021, the New Horizons spacecraft reached a distance of 50 astronomical units ("AU") from Earth. At that time, how many km was New Horizons from Earth? Note: One astronomical unit is the distance from the Earth to the Sun or about 150 million km. Question 3 (6 points): The planet Mars completes one orbit of the Sun in 687 days. Use scientific notation to express this time in units of seconds. You may use the character ∧
for the power of 10 , like 4.5×10 ∧
4 (4.5 times 10 to the 4 th power).
Answers
The time taken by the planet Mars to complete one orbit of the Sun is 5.94 x 10⁷ seconds.
Given information: In the spring of 2021, the New Horizons spacecraft reached a distance of 50 astronomical units ("AU") from Earth. One astronomical unit is the distance from the Earth to the Sun or about 150 million km.
Calculation: To find how many km was New Horizons from Earth, we need to multiply the distance in AU by the conversion factor. 1 AU = 150 million km 50 AU = 50 x 150 million km = 7.5 billion km Thus, the New Horizons spacecraft was 7.5 billion km from Earth in the spring of 2021. Now, let's move on to the second question. The planet Mars completes one orbit of the Sun in 687 days. We need to express this time in seconds using scientific notation.
To convert days to seconds, we need to multiply the number of days by the conversion factor. 1 day = 86400 seconds 687 days = 687 x 86400 seconds= 5.94 x 10⁷ seconds (using scientific notation) Therefore, the time taken by the planet Mars to complete one orbit of the Sun is 5.94 x 10⁷ seconds.
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what do you mean by MA of lever is 2
Answers
Answer:
MA of a lever is 2. It means the lever can lift a load of 2 times heavier than the effort
A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby has a mass of the carriage has__ energy. Calculate it.
Answers
The required energy the carriage has, when the displacement of the carriage and mass of the carriage with the baby are given is calculated to be 1029 J.
The energy in the above case is nothing but the work done by the carriage.
The work is defined as,
W = F d
where,
F is force
d is displacement
Entering the values in the above equation, we have,
W = F d = m × a × d = 5 × 9.8 × 21 = 1029 J
Thus, the required energy the carriage has is calculated to be 1029 J.
The given question is inappropriate. The question is 'a baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby has a mass of 5kg whats the energy the carriage has?'
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If a car is traveling 100 km/h west and comes to a stop in 3 min, what is the car's acceleration? Need procedure.
Answers
Answer:
a = 0.154 [m/s^2]
Explanation:
To solve this problem we must use the following formula of kinematics.
\(v_{f}= v_{i}-(a*t)\\\)
where:
Vf = final velocity = 0
Vi = initial velocity = 100 [km/h]
t = time = 3 [min] = 180 [s]
Now we need to convert the velocity from [km/h] to [m/s]
\(100[\frac{km}{h} ]*1000[\frac{m}{1km} ]*1[\frac{h}{3600s} ]=27.77[\frac{m}{s} ]\)
0 = 27.77 - (a*180)
a = 0.154 [m/s^2]
Note: the negative sign of the equation shows, that the car slows down until it stops
Materials that hold electrons very tightly, and thus don't allow much static electricity to occur around them, are called
Answers
1Which statement correctly applies to a car that changes its velocity over a period of time?
aThe combination of all forces acting on it is zero.
bNo net force is acting on it.
cA nonzero net force is acting on it.
dForces are acting on it.
2A group of students conducted several trials of an experiment to study forces and the acceleration they produce on a given object. The students decided to present the resulting data using a graph rather than a table. Which statement describes an advantage of presenting the data using a graph
a
Graphs visually show the relationship between the variables under investigation.
b
Tables cannot explicitly show the data from the investigation.
c
Graphs are more appealing than tables.
d
Tables with many rows of data are not very useful.
Answers
Answer:b a nonzero net force is acting on it
Explanation:
1) D; Forces are acting on it.
2) A; Graphs visually show the relationship between the variables under investigation.
1) Velocity is same as speed just that it has direction. Now Newton's first law of motion which is called law of inertia states that an object will continue in its present state of rest rest or remain in constant motion unless an external force acts on it.This means that for a cars speed to change, according to this law, it means external forces have acted on it.
Thus, option D is correct.
D; Forces are acting on it.
2) We want to show the relationship between force and acceleration using either table or graph.Now, a table will just use rows and columns to show us the value of a force per given acceleration. It doesn't show us a trend in terms of line or curve like the way graph will show.
This means that graphs give a better visual representation of the relationship between two variables than tables will do.
Thus, option A is correct.
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