A girl pulls her school bag with a force of 78 Newton inclined at 27° to the ground calculate the parts of the force moving the box along the ground ​

\(\\ \rm\bull\rightarrowtail Displacement=Velocity\times Time\)

\(\\ \rm\bull\rightarrowtail Displacement=8(14)\)

\(\\ \rm\bull\rightarrowtail Displacement =112m\)

The height the crane lifts the weight over the time period of 8.0s is 100m when it does work at the rate of \(2.5 *10^3\) watts to lift a 200-newton weight.

Given the rate of work done by crane (P) = \(2.5 * 10^3\)watts

The force exerted to lift a weight (F) = 200N

The duration of which weight was lifted (t) = 8.0s

Let the height the crane lifts the weight during this period = h

Also power is calculated as work done per unit time such that: P = W/t

\(2.5 * 10^3 = W/8.0s\)

\(W = 2*10^4\)

We know that work done on any object = force x distance moved

Work: W = F * d

W = F * h where d = distance = h

\(h = 2 * 10^4/200 = 100m\)

Hence the height the crane lifts the weight over this time period is 100m

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a. The faintest galaxies look redder because their stars are younger.

This prediction of the standard Big Bang theory has not been successfully verified by observations.

Option a is not a prediction of the standard Big Bang theory that has been successfully verified by observations. It refers to the idea that the faintest galaxies appear redder because their stars are younger.

However, the color of a galaxy is determined by several factors, including the age of its stars, the presence of dust, and the effects of cosmic expansion. While the age of stars in a galaxy can influence its color, it is not the sole determining factor.

Observations have shown that the color of galaxies can vary due to different reasons, and it is not solely linked to the age of their stars.

The successful verifications of the standard Big Bang theory include predictions such as the cosmic microwave background radiation, the abundance of light elements (helium, lithium, and beryllium), and the expansion of the universe.

Therefore, (a) Younger stars in faint galaxies cause them to appear redder in color.

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Electric field simply means an electric property that is associated with each point in a space when there is a charge present.

Your information is incomplete. Therefore, an overview of an electric field will be given.

An electric field simply means the physical field that surrounds particles that are electrically charged.

It should be noted that the electric field exerts force on the other charged particles that are in the field by either attracting or repelling them.

In conclusion, the SI unit of an electric field is volts per meter. This is also equivalent to Newton's per coulomb.

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Since the diagram above shows fossils and rock features, X is an intrusion that is younger than layers Y and Z. Therefore, the correct answer option is:  intrusion, younger than layers Y and Z.

In Science, a fossil can be defined as the mineral impression or remains of both living and non-living organisms that are generally considered to be prehistoric in nature.

Additionally, rock strata (layers) that are found in various parts of the world are usually unique and different from one another because they are all composed of distinct geological history of planet Earth, which are commonly referred to as fossils.

This ultimately implies that, fossils are ancient organisms such as plants and animals that were formed into rocks.

By critically observing the rock strata (layers) shown in the image attached above, we can reasonably infer and logically deduce that X would be classified as an intrusion and it is younger than rock layers Y and Z.

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Answer:

2. 4.63 x 10 to the -11th power

Explanation:

m1 = 3.1, m2= 6.3, d = 5.3, G = 6.67 × 10^-11

m1 · m2 = 3.1 · 6.3 = 19.5

d² = 5.3² = 28.1

19.5/28.1 = 0.694

(6.67 · 10^-11) · 0.694 = 4.63 × 10^-11

Answer:

Natural phenomenon

Explanation:

Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are attracted to one another.

Examples of this can be:

The force that holds the gases in the sun.

The force that causes a ball you throw in the air to come down again.

The force that causes a car to coast downhill even when you aren't stepping on the gas.

The force that causes a glass you drop to fall to the floor.

A bullet is fired upward with an initial velocity of 100 m/s. What will be it’s velocity when it hit the ground?

Zero. It is sitting on the ground.   This would almost always “assume” a friction-less environment where the only force acting on the bullet is gravity.  In this case, it would be 100 m/s immediately before hitting the ground. (zero once it comes to rest)

When a gas is heated, its molecules start moving at a much faster speed and this consequently causes an increase in pressure within the container holding the gas. If the container is not strong enough, the activity of the gas molecules is likely to cause it to burst.

What is pressure of a gas?

The force which the substance exerts on another substance per unit area is known as pressure. The pressure of the gas is the force that the gas exerts on the container boundaries. The gas molecules move randomly along the given volume. During this movement, they collide with the surface and also with each other. The impact of every individual gas molecule is too small and difficult to visualize. But the impact of all the gas molecules considered together constitutes the gas pressure. Greater the number of collisions, greater would be the pressure.

The Gas pressure formula is given as,

Gas pressure formula = F/A

Where,

F = impact force due to gas collisions in Newtons (N),

A = area in meter square

When a gas is heated, its molecules start moving at a much faster speed and this consequently causes an increase in pressure within the container holding the gas. If the container is not strong enough, the activity of the gas molecules is likely to cause it to burst.

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The magnitude of the resultant vector of two forces of 19.8 pounds and 36.5 pounds act on a body is 49.2 pounds that is option C.

The resulting value of two or more vectors can be calculated using the resultant vector formula. By calculating the vectors based on their respective orientations to one another, this is achieved. The resultant vector formula has several uses in engineering and science. This is illustrated via the interaction of many force vectors on a body, where the resulting vector is calculated using this formula.

Depending on the orientation of the vectors, there are three different types of resulting vector formulas. These equations apply to vectors moving in the same direction, vectors moving in the opposite direction, and vectors moving at an angle to one another.

We have two forces as 19.8 pounds and 36.5 pounds

by using the resultant formula we have,

R² = f1² + f2² + 2(f1)(f2)cos(θ)

R² = 19.8² + 36.5² + 2(19.8 x 36.5) cos(61.4)

= 1724.29 + 1445.4 x 0.478

= 1724.29 + 691.9

= 2416.2

R = \(\sqrt{2416.2}\)

R = 49.2 pounds.

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Answer:

Acceleration = 6m/s²

Explanation:

Given the following data;

Initial velocity = 35m/s

Final velocity = 65m/s

Time = 5 seconds

To find the acceleration;

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Mathematically, acceleration is given by the equation;

\(Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}\)

Where,

Substituting into the equation, we have

\(a = \frac{65 - 35}{5}\)

\(a = \frac{30}{5}\)

Acceleration = 6m/s²

Hi there!

1)

Since the charge placed in the middle is positive, we know that the particle is being repelled.

The particle experiences a greater repelling force by the 9μC charge. We can use the equation for electric force:
\(F_E = \frac{kq_1q_2}{r^2}\)

k = Coulomb's Constant

q₁, q₂: Charges (C)
r = distance between charges (m)

This is a VECTOR quantity, so we must subtract the forces since they point in opposite directions.

Force from 9μC particle:
\(F_E = \frac{k(.000005)(.000009)}{2^2} = .101\\\\\)

Force from 4μC particle:
\(F_E = \frac{k(0.000005)(0.000004)}{2^2} = 0.0450\)

Subtract:
\(.101 - 0.0450 = \boxed{0.561 N}\)

2)

We can find a position by setting the two equations equal to one another. (Both repelling forces must be EQUAL for the force = 0 N)

Let the distance between the 9μC and 5μC charge equal 'x', and the distance between the 4μC and 5μC charge equal '4 - x'.

\(\frac{k(0.000009)(0.000005)}{x^2} = \frac{k(0.000004)(0.000005)}{(4 - x)^2}\)

Cancel out 'k' and the 5μC value.

\(\frac{0.000009}{x^2} = \frac{0.000004}{(4 - x)^2}\)

Solve for 'x' using a graphing utility.

\(\boxed{x = 2.4 m}\)

The drift mobility of electrons in Cu is the ratio of the electric field to the charge carried by an electron and the time it takes for an electron to reach from one end of a conductor to the other under an applied electric field.

The Hall coefficient is defined as \(RH = (1/ne) * (dVH/dB)\) where n is the charge density, e is the charge of an electron, VH is the Hall voltage, and B is the magnetic field. To calculate the drift mobility of the electrons in Cu, we will first determine the charge density n using the Hall coefficient.

We can then use the conductivity and charge density to calculate the drift mobility. Given, Hall coefficient \(RH = 0.45 × 10^-10 m^3/A s\)  and Conductivity \(σ = 6.5 /ohm\) meter at a temperature of 400K. (Magnetic field)

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Answer:

Sound wave X amplitude is greater than 'A' and its frequency is lesser than

'f'

Explanation:

The pitch of a sound is dictated by the frequency of the sound wave, while the loudness is dictated by the amplitude.

A high pitch sound corresponds to a high frequency and a low pitch sound corresponds to a low frequency.

The larger the amplitude of the waves, the louder the sound and vice-versa.

From the question,

Sound wave W has amplitude ‘A' and frequency 'f' and

Sound wave X is louder and lower in pitch than sound wave W.

Since sound wave X is louder, this means its amplitude is greater than 'A'.

Also, since sound wave X is lower in pitch, this means its frequency is lesser than 'f'.

Answer:

Higher than A, Lower than F

Explanation:

As the two socks are being spun too slowly, they are probably not going to stick together since the static charge would be too small to cause them to adhere.  

An imbalance in the charged particles of the thing is what causes static electricity, according to this definition. Until they are released or discharged, these charges remain on the object's surface. Static electricity is produced at the surface of the object as a result of these charges.

When a dryer's electricity supply is turned on, clothing spin faster and become stuck to one another, creating friction force between them. When the supply gets off, the spinner stopped its movement and the result is the static electricity that causes the socks to stuck together.

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Answer:

The lifting force of a balloon is equal to the weight of the air it displaces, minus the weight of the balloon itself and any cargo it is carrying. We can calculate the lifting force using the following formula:

Lifting force = (4/3) x π x r^3 x ρair x g - m_balloon - m_cargo

where:

- r is the radius of the balloon (in meters)

- ρair is the density of air (in kg/m^3), which we'll assume is 1.2 kg/m^3 at sea level and standard temperature

- g is the acceleration due to gravity (in m/s^2), which we'll assume is 9.81 m/s^2

- m_balloon is the mass of the balloon (in kg)

- m_cargo is the mass of the cargo (in kg)

- π is pi (approximately 3.14)

Substituting in the values given in the problem, we get:

Lifting force = (4/3) x π x (7.15 m)^3 x (1.2 kg/m^3) x 9.81 m/s^2 - 930 kg - m_cargo

Simplifying and solving for m_cargo, we get:

m_cargo = (4/3) x π x (7.15 m)^3 x (1.2 kg/m^3) x 9.81 m/s^2 - 930 kg - Lifting force

Plugging in the lifting force we want the balloon to have, which we'll call L, we get:

m_cargo = (4/3) x π x (7.15 m)^3 x (1.2 kg/m^3) x 9.81 m/s^2 - 930 kg - L

Assuming we want the balloon to lift 5000 kg of cargo, we can solve for L:

L = (4/3) x π x (7.15 m)^3 x (1.2 kg/m^3) x 9.81 m/s^2 - 930 kg - 5000 kg

L = 281,581 N

Therefore, to lift 5000 kg of cargo, the balloon needs to have a lifting force of approximately 281,581 N.

We have,

We know that,

As, we already have the value of pressure, let's calculate that of force now;

Just put all the values in the formula now;

As, it is already mention that we need to find the radius of the mug, it is obviously a circular base.

We know that,

So, let's solve it;

Thus, the radius of the circle is 35 cm.

Answer:

Chemical energy transformations take place from the outlet charger to the ringing phone.

Explanation:

chemical energy

While charging the mobile electrical energy gets transformed into chemical energy. Most of the contemporary mobile phone batteries are lithium-ion batteries where the power is saved by the chemical transformations in the ionic structure of the battery.  When the power gets into the mobile phone it is transformed and collected as chemical energy inside of the battery and when we utilize the mobile the earlier saved chemical energy is again transformed into electrical energy.

The energy transformation that takes place from the outlet charger to the

ringing phone is electrical energy from the outlet is converted to chemical

energy and back to electrical energy and sound energy when the phone is

being used and ringing.

The charger provides a source of electrical energy which gets converted to

chemical energy stored in the battery. During use, the chemical energy gets

converted to electrical energy to power the phone and to sound energy

when it rings with heat energy being dissipated also.

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Answer:

The volume of water displaced by the raft is 0.233 m³

Explanation:

The question relates to Archimedes' principle which states that the buoyant force experienced by an object immersed in a fluid is equal to the weight of (the force of gravity on) the displaced fluid

The given parameters are;

The combined mass of the person and the raft, m = 233 kg

The liquid on which the raft is located = Water

The density of water, \(\rho _{water}\) = 1000 kg/m³

Weight = Mass, m × g

Where;

m = The mass of the object

g = The acceleration due to gravity = 9.8 m/s²

Given that the raft is on the surface of the water (floating), the buoyant force is equal to the combined weight of the person and the raft = 233 kg

The combined weight of the person and the raft, \(W_{combined}\) = 233 kg × 9.8 m/s² = 2,283.4 N

Therefore;

The buoyant force = 2,283.4 N = The weight of the water displaced

The mass of the water displaced, \(m_{water}\), = 2,283.4 N/(9.8 m/s²) = 233 kg

Density = Mass/Volume

The volume of water displaced by the raft = The mass of the water displaced/(The density of the water) = 233 kg/(1,000 kg/m³) = 0.233 m³.

Answer:

the volume displaced by the raft = 0.233 m3

Explanation:

correct for Acellus

If the kinetic energy of the train decreases from 314 J to 250 J, the gravitational potential energy of the system It increases from 2 J to 66 J.

The principle of conservation of mechanical energy states that the total mechanical energy of a system is always constant. This means that the sum of the potential and the kinetic energy does not change.

Thus, if the kinetic energy of the train decreases from 314 J to 250 J, the gravitational potential energy of the system It increases from 2 J to 66 J.

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Answer:

* viajan a través del aire, liquido o solido

*Moverse en la misma dirección que el flujo de energía

Explanation:

En el análisis de ondas existen dos tipo fundamentales: Transversales y longitudinales.

La ondas transversales las oscilación de la partícula es perpendicular al movimiento de la misma.

En la onda longitudinal el movimiento de la partícula es en la misma dirección que el movimiento de la onda, por esta razón están ondas se llaman ondas de compresión.

En base a las definiciones iniciales las frases correctas son:

* viajan a través del aire, liquido o solido

*Moverse en la misma dirección que el flujo de energía

Answer:

Cause molecules to vibrate

Travel through air, liquid, or solid

Move in the same direction as energy flow

Explanation:

Answer:

(D) is visible light

Explanation:

(F) is xray and (B) is radio

Answer:

The amount of force will increase

Explanation:

Answer:

The mass of an object affects gravity.

Explanation:

Answer:

The mass of an object affects gravity.

Explanation:

In order to have a planet that has a force of gravity similar to that of the earth, the space ship must land in Borros whose radius is half of the earth's radius and has one - fourth of the earth's mass.

The force of gravity is obtained from;

F = Gm1m2/r^2 It is an example of an inverse square law.

For another planet, Borros, the radius is half of that of the earth and the mass is one - fourth of that of the earth, hence;

F = 1/4Gm1m2/(r/2)^2

F = 1/4Gm1m2/r^2/4

F = Gm1m2/r^2

Therefore, the planet that is most similar to the earth is Borros because,  the gravity would be stronger , but since it is only one fourth the mass , the changes balance out and the gravity will be the same as on Earth.

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A distance-time graph is a straight line for constant speed.  In a distance-time graph, the x-axis represents time and the y-axis represents distance. When an object is moving at a constant speed, the distance it covers over time increases at a steady rate. This results in a straight line on the graph, where the slope of the line indicates the constant speed.

A distance-time graph shows the distance an object travels over a period of time. If the object is moving at a constant speed, then the graph will be a straight line. This is because the distance traveled in each unit of time is the same, so the slope of the line (which represents the speed) will be constant.

On the other hand, if the object is accelerating, the graph will not be a straight line, as the speed is increasing over time. Similarly, momentum has to do with the mass and velocity of an object, and is not directly related to distance and time. Average speed can also vary over time, so the graph would not be a straight line for this variable either.

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Poor circulation is not a benefit of stretching.

How many minutes of stretching should a person perform before participating in physical activities?

Stretching for 5 to 10 minutes is probably enough for most activities. It's important, however, to adequately stretch all the muscles you'll be using. Three benefits of stretching before a workout include increased blood flow.

What are the 5 benefits of stretching?

Which benefit comes with flexibility?

Activities that lengthen and stretch muscles can help you prevent injuries, back pain, and balance problems. A well-stretched muscle more easily achieves its full range of motion.

Thus, poor circulation is the correct option.

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Answer:344

Explanation:

The mathematical representations of the resulting wave as a function of time is y(t) = Asin(2π ft  +  ϕ).

The resulting wave function is determined as follows;

y(t) = Asin(2π ft  +  ϕ)

Where;

To construct a graphical representation of the wave, we will plot a displacement versus time graph as shown in the image uploaded. The wave will repeat after 1/f seconds, which is the period of the wave.

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