The emf and the internal resistance of a battery are as shown in the figure. If a current of 5 a is drawn from the battery when a resistor r is connected across the terminals a and b of the battery, what is the voltage drop across the resistor r?.
Answers
the voltage drop across the resistor r is 5R V.
Given that,
Current through the resistor, r = I = 5 A
Resistance of the resistor, r = R
Internal resistance of the battery, r = 1 Ω
Electromotive force (emf) of the battery = E = 10 V
By Kirchhoff’s law,
Voltage drop across R = I × R
= 5 × R V
Therefore, the voltage drop across the resistor r is 5R V.
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Related Questions
A light spring with force constant 3.70 N/m is compressed by 8.64 cm as it is held between a 0.261-kg block on the left and a 0.522-kg block on the right, both resting on a horizontal surface. The spring exerts a force on each block, tending to push them apart. The blocks are simultaneously released from rest. Find the acceleration with which each block starts to move, given that the coefficient of kinetic friction between each block and the surface is the following. (Let the coordinate system be positive to the right and negative to the left. Be sure to include the sign to indicate the direction of the acceleration.) (a) μ = 0 heavier block lighter block (b) μ = 0.110 heavier block lighter block (c) μ = 0.480 heavier block lighter block m/s² m/s² m/s² m/s² m/s² m/s²
Answers
The lighter block will also accelerate to the right with an acceleration of -0.82 m/s².
(a) μ = 0
The heavier block will accelerate to the right with an acceleration of:
a = F / m = k x / m = (3.70 N/m) (0.0864 m) / 0.261 kg = 1.22 m/s²
The lighter block will also accelerate to the right with an acceleration of 1.22 m/s².
(b) μ = 0.110
The heavier block will accelerate to the right with an acceleration of:
a = F - μk / m = k x / m - μk / m = (3.70 N/m) (0.0864 m) / 0.261 kg - (0.110)(0.261 kg)(9.80 m/s²) = 0.68 m/s²
The lighter block will not accelerate because the force of friction is greater than the force of the spring.
(c) μ = 0.480
The heavier block will accelerate to the right with an acceleration of:
a = F - μk / m = k x / m - μk / m = (3.70 N/m)(0.0864 m) / 0.261 kg - (0.480)(0.261 kg) (9.80 m/s²) = -0.82 m/s²
Therefore, the lighter block will also accelerate to the right with an acceleration of -0.82 m/s².
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A skater holds her arms outstretched as she spins at 120 rpm. Part A What is the speed of her hands if they are 140 cm apart? Express your answer with the appropriate units
Answers
According to the question the speed of the skater's hands is 528 m/min.
To calculate the speed of the skater's hands, we can use the formula:
Speed = Circumference * Revolutions per minute
Given that the skater's hands are 140 cm apart and she spins at 120 rpm, we need to calculate the circumference of the circle formed by her hands.
The circumference of a circle is given by the formula:
Circumference = 2 * π * radius.
In this case, the radius is half the distance between the skater's hands, which is 140 cm / 2 = 70 cm.
Converting the radius to meters, we have 70 cm = 0.7 m.
Now we can calculate the circumference:
Circumference = 2 * π * 0.7 m = 4.4 m (rounded to one decimal place).
Finally, we can calculate the speed of the skater's hands:
Speed = Circumference * Revolutions per minute
= 4.4 m * 120 rpm
= 528 m/min.
Therefore, the speed of the skater's hands is 528 m/min.
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Which has greater kinetic energy: a bullet that has a mass of 0.05 kg travelling at 2500 m/s, or a lorry that has a mass of 4500 kg and is moving at 50 m/s?
Answers
Answer:
its the lorry
Explanation:
The kinetic energy of the truck will be, 5625000 kg m/s and the kinetic energy of the bullet will be 156250 kg m/s. So the kinetic energy of the lorry will be higher than the kinetic energy of the Bullet.
What is Kinetic Energy?Kinetic energy is a type of energy that a particle or an object possesses as a result of its motion. By exerting a net force on an item, work is done, which transfers energy; as a result, the object accelerates and obtains kinetic energy.
A moving item or particle's ability to move depends on both its mass and velocity. This is known as kinetic energy. Translation (or movement along a path from one location to another), rotation about an axis, vibration, or any combination of motions are examples of possible types of motion.
According to the question,
K.E of the lorry: 1/2 (4500)(50)²
K.E of the lorry = 5625000 kg m/s.
K.E of the bullet: 1/2(0.05)(250)²
K.E of the bullet = 156250 kg m/s
Hence, the kinetic energy of the lorry is greater than the kinetic energy of the bullet.
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Is it possible for the material to let some
light lout not let others?
Answers
Answer:BY opening it and closing it quickly to make a tiny bit of it come out
Explanation:
An aerobatic airplane pilot experiences
weightlessness as she passes over the top of
a loop-the-loop maneuver.
The acceleration of gravity is 9.8 m/s^2
If her speed is 280 m/s at this time, find the
radius of the loop.
Answer in units of km.
Answers
For weightless object, gravity is equal to centripetal acceleration. The radius of the loop is calculated as 8 km.
What is centripetal acceleration?The property of the motion of an object traversing a circular path is known as centripetal acceleration. Any object that is moving in circle and has an acceleration vector pointed towards center of that circle is Centripetal acceleration.
As Centripetal Acceleration formula is;
a = v²/r
Given, V- velocity = 280 m/s
And we know that for weightless object,
Gravity = centripetal acceleration
So, a = g
given, g =9.8 m/s²
So,9.8 = 280²/r
r= 8000 m
Radius of the loop = 8 km
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Wavelength
(meters)
Radio Microwave Infrared
10
102
10-5
About the size of...
Visible Ultraviolet
5x106
10
X-ray Gamma Ray
10-10
10 10-12
www www
tt
214 à & f &
Buildings Humans Honey Bee Pinpoint Protozoans Molecules Atoms Atomic Nuclei
A. visible light
C. gamma rays
According to this chart, which form of electromagnetic
radiation has the longest wavelength?
B. ultraviolet light
D. radio waves
Please help 30 points and will mark brain thing
Answers
The form of electromagnetic radiation with the longest wavelength according to the chart is radio waves, which have a wavelength of \(10^{5}\)meters. So, the correct answer is D. radio waves.
What is Wavelength?
Wavelength is a physical quantity that measures the distance between two consecutive peaks or troughs of a wave. It is usually denoted by the Greek letter lambda (λ) and is measured in units of length, such as meters (m), centimeters (cm), or nanometers (nm). In other words, wavelength is the distance over which a wave repeats itself.
The question asks which form of electromagnetic radiation has the longest wavelength. Based on the chart, the answer is D. radio waves. Radio waves have wavelengths of about 10 meters to \(10^{5}\) meters, which is much longer than the wavelengths of visible light, ultraviolet light, X-rays, and gamma rays. In fact, radio waves are about the same size as buildings, while gamma rays are about the same size as atomic nuclei.
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two identical waves of amplitude 5cm meet alarge ripple tank what will be amplitude of combined wave at apoint were they interference contructive and were they interfere destrucgivelythis is
Answers
The combined amplitude of two identical waves of amplitude 5 cm depends on whether the interference is constructive or destructive.
Constructive Interference: When two waves interfere constructively, their amplitude increases. In this scenario the combined waveform will have an amplitude equal to the sum of the individual amplitudes if the two waveforms are in phase (crest aligns with crest and trough aligns with trough). Consequently, in constructive interference, the amplitude of the combined wave will be 5 cm + 5 cm = 10 cm.
Destructive Interference : Interference that is destructive occurs when two waves interact in a way that cancels out each other's amplitudes. The amplitude of the combined waveform will be equal to the difference between the individual amplitudes in this case if the two waveforms are out of phase (peak aligned with trough). In destructive interference, the amplitude of the combined wave will be 5 cm – 5 cm = 0 cm.
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1. A car starts from the rest on a circular track with a radius of 300 m. It accelerates with a constant tangential acceleration of a = 0.75 m/s?. Determine the distance traveled and the time elapsed"
Answers
Starting from rest on a circular track with a radius of 300 m and a constant tangential acceleration of 0.75 m/s², the car will travel a distance of approximately 0.2119 meters or 21.19 centimeters in 0.75 seconds.
To determine the distance traveled and the time elapsed by the car starting from rest on a circular track with a radius of 300 m and a constant tangential acceleration of 0.75 m/s², we can use the equations of circular motion.
The tangential acceleration is the rate of change of tangential velocity. Since the car starts from rest, its initial tangential velocity is zero (v₀ = 0).
Using the equation:
v = v₀ + at
where v is the final tangential velocity, v₀ is the initial tangential velocity, a is the tangential acceleration, and t is the time, we can solve for v:
v = 0 + (0.75 m/s²) * t
v = 0.75t m/s
The tangential velocity is related to the angular velocity (ω) and the radius (r) of the circular track:
v = ωr
Substituting the values:
0.75t = ω * 300
Since the car starts from rest, the initial angular velocity (ω₀) is zero. So, we have:
ω = ω₀ + αt
ω = 0 + (0.75 m/s²) * t
ω = 0.75t rad/s
We can now substitute the value of ω into the equation:
0.75t = (0.75t) * 300
Simplifying the equation gives:
0.75t = 225t
t = 0.75 seconds
The time elapsed is 0.75 seconds.
To calculate the distance traveled (s), we can use the equation:
s = v₀t + (1/2)at²
Since the initial velocity (v₀) is zero, the equation becomes:
s = (1/2)at²
s = (1/2)(0.75 m/s²)(0.75 s)²
s = (1/2)(0.75 m/s²)(0.5625 s²)
s = 0.2119 meters or approximately 21.19 centimeters
Therefore, the car travels a distance of approximately 0.2119 meters or 21.19 centimeters.
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GIVING BRAINLY, FOLLOW, STARS AND POINTS
Which of the following descriptions of these structures is accurate?
a. they are manufactured shell structures
b. they are manufactured mass structures
C. it's a manufactured shell structure
Answers
Answer:
Wheres. The. Pics. Of. The. Structures
Explanation:
The two equations below express conservation of energy and conservation of mass for water flowing from a circular hole of radius 3 centimeters at the bottom of a cylindrical tank of radius 10 centimeters. In these equations, ? m is the mass that leaves the tank in time At, v is the velocity of the water flowing through the hole, and h is the height of the water in the tank at time t. g is the accelertion of gravity, which you should approximate as 1000 cm/s2. The first equation says that the gain in kinetic energy of the water leaving the tank equals the loss in potential energy of the water in the tank. The second equation says that the rate at which water leaves the tank equals the rate of decrease in the volume of water in the tank (which is conservation of mass because water has constant density) 10' Derive a differential equation for the height of water in the tank. dh dt If the initial height of the water is 30 centimeters, find a formula or the solution h(t) According to the model, how long does it take to empty the tank? Another way to solve this differential equation is to make the substitution w h. What is the differential equation that w satisfies? seconds dw dt
Answers
The differential equation for the height of water in the tank is: dh/dt = -k * sqrt(h) . If the initial height of the water is 30 centimeters, then the solution to the differential equation is: h(t) = 30 * exp(-kt^2)
According to the model, it takes 15 seconds to empty the tank. The first equation states that the gain in kinetic energy of the water leaving the tank equals the loss in potential energy of the water in the tank.
The second equation states that the rate at which water leaves the tank equals the rate of decrease in the volume of water in the tank. We can combine these two equations to get the following differential equation:
dh/dt = -k * sqrt(h)
where k is a constant that depends on the radius of the hole and the acceleration of gravity.
If the initial height of the water is 30 centimeters, then we can solve the differential equation to get the following solution:
h(t) = 30 * exp(-kt^2)
where t is the time in seconds.
Plugging in t=15, we get h(15)=0, which means that the tank is empty after 15 seconds.
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9.00 V is applied to a wire with aresistance of 52.0 2. At what distancefrom the wire is the imagnetic field2.22 x 10-8 T?
Answers
Answer:
1.56 m
Explanation:
First, we need to find the current in the wire, so we will use the following equation:
\(V=IR\)Where V is the voltage, R is the resistance and I is the current. Replacing the values and solving for I, we get:
\(\begin{gathered} 9V=I(52\Omega) \\ \frac{9V}{52\Omega}=I \\ 0.17A=I \end{gathered}\)So, the current is 0.17 A.
Now, the magnetic field generated by a wire with current I at a distance r is equal to:
\(B=\frac{\mu I}{2\pi r}\)Where μ is 4π x 10^(-7). So, replacing the values and solving for r, we get:
\(\begin{gathered} (2.22\times10^{-8})=\frac{(4\pi\times10^{-7})(0.17)}{2\pi r} \\ (2.22\times10^{-8})r=\frac{(4\pi\times10^{-7})(0.17)}{2\pi r}\cdot r \\ (2.22\times10^{-8})r=\frac{4\pi\times10^{-7}(0.17)}{2\pi} \\ (2.22\times10^{-8})r=3.4\times10^{-8} \\ \frac{(2.22\times10^{-8})r}{2.22\times10^{-8}}=\frac{3.4\times10^{-8}}{2.22\times10^{-8}} \\ r=1.56\text{ m} \end{gathered}\)Therefore, the distance is 1.56 m
how much charge can the capacitor carry before dielectric breakdown of the air between the plates occurs?
Answers
The capacitor can carry 6.6 × 10⁻³ F charge, if the parallel plate capacitor with C=2.2μF and plate separation is 1 mm.
Electric potential difference across cap. plates and E field inside related by separation d. Maximum allowed field before breakdown then implies maximum voltage for given d.
Let the critical field, E₁ = 3 × 10⁶ v/m
Separation between the plates, d = 1 mm = 1 × 10⁻³ m
The breakdown voltage, V₁ = E₁ × d
V₁ = 3 × 10⁶ × 1 × 10⁻³ = 3 × 10³ V
Charge carry by the capacitor during breakdown, Q = C × V₁
Q = 2.2 × 10⁻⁶ × 3 × 10³
Q = 6.6 × 10⁻³ F
--The give question is incomplete, the complete question is,
"How much charge a parallel plate capacitor with C=2.2μF, and separation of plate 1 mm, can carry before the dielectric breakdown. If the critical field is, E₁ = 3 × 10⁶ v/m.
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The International Energy Agency defines energy access to include all of the following EXCEPT A first connection to electricity An increasing level of electricity consumption over time Access to clean cooking facilities Access to motorized transportation Question Adoption of a cookstove intervention in rural Bangladesh is extremely low. As a consultant to the UN, you are asked for your opinion on why this occurred. Which of the following is/are a plausible explanation(s)? The technology was not well maintained by users All of these answers are correct The stoves failed to take into account regional cooking preferences The stoves failed to take into account regional cooking preferences The chosen stove was too complicated for less well-educated users
Answers
The correct answer is: All of these answers are correct.
All the provided explanations can be plausible reasons for the low adoption of a cookstove intervention in rural Bangladesh. It is important to consider factors such as technology maintenance, regional cooking preferences, and the suitability of the chosen stove for the user's level of education.
All of these factors can significantly impact the acceptance and adoption of a new cooking technology.It would hinder their ability to effectively use and benefit from the intervention.
Considering these factors collectively provides insight into why the adoption rate remained low. Addressing these issues is crucial to improving the acceptance and success of cookstove interventions in rural communities.
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Interference pattern? An electron beam is aimed at two closely spaced slits. The beam is attenuated to produce only one electron per minute.
Yes or No
Answers
"An electron beam is aimed at two closely spaced slits. The beam is attenuated to produce only one electron per minute is known as interference pattern." The answer is yes.
When an electron beam is aimed at two closely spaced slits, the electrons passing through the slits will interfere with each other, producing an interference pattern on a screen behind the slits. The interference pattern will be a series of bright and dark bands, where the bright bands correspond to constructive interference and the dark bands correspond to destructive interference.
When a beam of electrons is passed through two closely spaced slits, it creates an interference pattern on a screen behind the slits. This pattern results from the wave-like behaviour of electrons and the interference between the electrons passing through the two slits. The pattern appears as a series of bright and dark bands, where the position and intensity of the bands are determined by the relative phase of the electrons.
The interference pattern only becomes noticeable with a large number of electrons passing through the slits at the same time. If only one electron is passing through the slits per minute, the pattern will not be easily observable.
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A wave has a wavelength of 4 m and a frequency of 85 Hz. What is the speed of this wave?
Answers
The speed of wave with a wavelength of 4 m and a frequency of 85 Hz is 340m/s
The speed of a wave is the product of the frequency of the wave and its wavelength. Mathematically, it is expressed as:
\(v = f \lambda\) where:
f is the frequency
\(\lambda\) is the wavelength
Given the following:
f =85Hz
\(\lambda\) = 4 m
Substitute the given parameter into the formula:
v = 85 × 4
v = 340m/s
Hence the speed of wave with a wavelength of 4 m and a frequency of 85 Hz is 340m/s
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How does a person’s nutritional needs change with an increase in activity to gain muscle mass?
Answers
Answer:
Dietary carbohydrates provide the body with energy for tough workouts and replenish energy stores in muscles in the form of glycogen.
Explanation:
Which type of star system has the most stars?
open cluster
globular cluster
eclipsing binary
binary star system
Answers
Answer: The answer is B, Globular Cluster.
Explanation: Why did you delete my answer?? Anyways...
A Globular cluster has hundreds of thousands to millions of stars. Since a Globular Cluster is found to be the cluster with the most stars in it, therefore, the globular cluster is the answer.
The Globular cluster type of star system has the most stars.
What is a solar system?It is a system that collection of all the planets and spatial bodies revolving around the sun because of the gravitational pull of the sun.
Our Solar System is based on a heliocentric model in which the Sun is assumed to reside at the central point of the planetary system.
In other words, the Sun is at the center while the Earth and other planetary bodies revolve around it.
The star system that has the most stars is known as a globular cluster.
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A pull back toy car accelerates for 1.8 seconds and covers 4 m while speeding up after being released from rest.
Answers
Answer:
Acceleration, a = 2.47 seconds
Explanation:
Given the following data;
Time, t = 1.8 seconds
Distance = 4 meters
Initial velocity = 0 m/s (since it's starting from rest)
To find the acceleration of the toy car, we would use the second equation of motion;
\( S = ut + \frac {1}{2}at^{2}\)
Where;
S represents the displacement or height measured in meters.
u represents the initial velocity measured in meters per seconds.
t represents the time measured in seconds.
a represents acceleration measured in meters per seconds square.
Substituting into the equation, we have;
Substituting into the formula, we have;
\( 4 = 0(1.8) + \frac {1}{2}*a*(1.8)^{2}\)
\( 4 = 0 + \frac {1}{2}*a*3.24\)
\( 4 = \frac {1}{2}*a*3.24\)
Cross multiplying, we have;
\( 8 = 3.24a\)
\( a = \frac {8}{3.24}\)
Acceleration, a = 2.47 seconds
Help pls ;) and thank you
Answers
Answer:
1a) Transverse wave.
1b) Ripples on the surface of water.
1c) See first attachment.
1d) See below for explanation.
2a) Longitudinal wave.
2b) Sound waves.
2c) See second attachment.
2d) See below for explanation.
Part 2) 54 m/s
Explanation:
Part 1Question 1a) The wave in the picture is a transverse wave.
In transverse waves, the oscillations are at right angles to the direction of wave travel.
b) A real world example of a transverse wave is ripples on the surface of water.
c) See first attachment.
The crest is the highest point.The trough is the lowest point. The wavelength is one full wave cycle measured from crest to crest, or trough to trough.d) The amplitude is the maximum displacement of a point of a wave from its resting position. It is measured by calculating the difference in height between a crest and the resting position (mid-line).
Question 2a) The wave in the picture is a longitudinal wave.
In longitudinal waves, the oscillations are parallel to the direction of wave travel.
b) A real world example of a longitudinal wave is sound waves.
c) See second attachment.
Compression: The region where the particles are compressed together.Rarefaction: The region where the particles are spread apart.Wavelength: One full wave cycle measured from one compression to the next compression, or from one rarefaction to the next rarefaction.d) The amplitude is the maximum displacement of a point of a wave from its resting position. It is measured by calculating the distance between the particles in the areas where it is compressed.
Part 2Wave Speed
\(\large\boxed{v=f \lambda}\)
where:
v = Wave speed measured in meters per second (m/s).f = Frequency measured in Hertz (Hz).λ = Wavelength measured in meters (m).Given values:
Frequency = 60.0 HzWavelength = 0.90 mSubstitute the given values into the formula and solve for speed:
\(\implies v=60.0 \times 0.90\)
\(\implies v=54\;\sf m/s\)
Therefore, the speed of the wave is 54 m/s.
when the top of the electrode leads the welding end of the electrode, and the welding arc is pointing back toward the weld bead, the travel angle is called a(n) ____ angle.
Answers
According to the information we can infer that the travel angle is called a "drag" angle.
How is it call a travel angle?In welding terminology, the travel angle refers to the angle between the axis of the electrode and the workpiece surface. When the top of the electrode leads the welding end (meaning the electrode is inclined downward at an angle) and the welding arc is pointing back toward the weld bead, it is known as a "drag" angle.
In this configuration, the electrode is dragged along the surface of the workpiece, creating a trailing arc direction. This technique is commonly used in certain welding processes, such as shielded metal arc welding (SMAW) or stick welding, to control the heat input and the direction of the molten metal flow during the welding operation.
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Observing that the bulb does not glow in circuit X , Raj changed the circuit as shown in figure Y.
a. What did he observed in circuit Y?
b. Why did the bulb not glow in figure X?
c. What will happen if the number of the cells will increase in circuit Y?
Answers
Answer:
a. He notices that when he kept the compass near the electrical wire with current flowing through it, the compass did not point north; instead, the compass needle pointed in the direction of the current's magnetic field.
b. The bulb did not glow because the current was not sufficient to make it glow.
c. Deflection in the compass will increase further.
Explanation:
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If 100 grams of water is to be heated from 24.0°C to 100.0°C to make a cup of tea, how much heat must be absorbed? The specific heat of water is 4.184 J/g∙°C
Solve the problem and show your work.
Answers
Answer:
76*
Explanation:
Answer:
Q= 31,798.4
Explanation:
You would use the specific heat formula which is Q=mCΔt
m(mass)=100
C(Specific heat capacity)= 4.184
Δt(change in temperature)=24-100=-76 or just 76 in this case
so Q=(100)(4.184)(76)=
418.4(76)=31,798.4
Therefore the missing value Q(heat lost or gained) equal 31,798.4
Hope that helped! xoxo
7. What is the correct sequence of rock layers from oldest to youngest?
Answers
Answer: you have it correct
Explanation:
Answer:yall dumd dang thought yall know better
Explanation:
hehe
If I keep F constant in F=ma, what is the relationship between m and a?
Answers
Answer:
If F is a constant, we can take f = 1
f = m×a
ma = 1
therefore we can say that force is hence proportinal to the product of mass and acceleration.
2
A simple circuit contains a battery and a resistor.
Over 3.0 hours, 29 000 C of charge passes through the resistor.
Calculate the current flowing through the circuit during this time.
Give your answer to two significant figures.
Answers
Answer:
Approximately \(2.69\; {\rm A}\).
Explanation:
Ensure that all values are measured in standard units. Charge should be measured in coulombs, while time should be measured in seconds:
\(\begin{aligned}t &= 3.0\; {\rm hr} \times \frac{3600\; {\rm s}}{1\; {\rm hr}} = 10800\; {\rm s}\end{aligned}\).
Electric current \(I\) is the rate of flow of electric charge.
In order to find the electric current, divide electric charge \(q\) by the time \(t\) required to transfer these charge. If charge \(q\!\) is measured in coulombs and time \(t\!\) is measured in seconds, the unit of current \(I\)would be amperes:
\(\begin{aligned}I & = \frac{q}{t} \\ &= \frac{29000\; {\rm C}}{10800\; {\rm s}} \approx 2.69\; {\rm A}\end{aligned}\).
9 a current was sent through a helical coil spring. the spring contracted, as though it had been compressed. why?
Answers
This phenomenon is a result of the interaction between the magnetic field generated by the current and the magnetic field it induces within the spring.
When an electric current flows through a helical coil spring, it creates a magnetic field around the wire. According to Ampere's law, this magnetic field induces a magnetic field within the spring itself. T
This phenomenon is known as magnetic compression. The induced magnetic field within the spring interacts with the original magnetic field, causing an attractive force between the coils of the spring.
The degree of contraction depends on factors such as the magnitude of the current, the number of coils in the spring, and the material properties of the spring. This principle finds applications in various devices such as solenoids, relays, and electromagnets, where controlled magnetic compression is utilized for mechanical movements or to generate forces.
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A stone is thrown horizontally at 15 m/s from the top of a cliff. It takes it 2.4 s to hit the ground. How far from the base of the cliff does the stone hit the ground
Answers
Distance=Speed*Time
Distance=15*2.4
Distance=36m
When the curvature radius of a converging lens is increased, the size of the image _(blank)_.
A. is magnified
B. is reduced
C. stays the same
Answers
When the curvature radius of a converging lens is increased, the size of the image is reduced.
What is radius of curvature ?“The radius of curvature is the radius of sphere formed by the convex or concave mirror.” It is also equal to the distance between the pole and centre of curvature.” The sign convention for focal length and radius of curvature is the same.
What is converging lens?“Converging lenses are lenses which converge the light rays coming towards them, whereas diverging lenses are lenses which diverge the rays coming towards them.” A converging lens have positive focal length.
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A tennis ball is thrown upwards from the edge of a cliff with a speed of 10\,\dfrac{\text m}{\text s}10 s m 10, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction. It lands on the ground below the cliff 3.03.03, point, 0 seconds later. We can ignore air resistance. What is the displacement of the tennis ball? Answer using a coordinate system where upward is positive. Round the answer to two significant digits.
Answers
Answer:
5.1m
Explanation:
Given the following parameters
Speed v = 10m/s
Time = 3.0s
Required
Displacement of the tennis ball
Using the equation of motion
v² =u²-2gh (g i s negative due to upward motion of the ball)
Substitute the given values into the expression above;
0² = 10²-2(9.8)h
0 = 100-19.6h
19.6h = 100
h = 100/19.6
h= 5.1m
Hence the displacement of the ball is 5.1m
When are the kinetic and gravitational potential energy levels the same?
Answers
Answer:
the halfway point
Explanation:
As an object falls under the influence of gravity, kinetic energy and potential energy are equal at the halfway point only.