Is it true that an object moves in a a circle at a constant speed will also have a constant velocity ?

Answer: D just took the test

Explanation:

Answer:

D

Explanation:

Ohm's law states that:

where V is the voltage, R is the resistance and I is the current; in this case the current is 0.51 A and the resistance is 29 Ohms. Plugging these and solving for the voltage we have:

Therefore, the voltage is 14.79 V

Answer:

Explanation:

time= distance/speed

20km/ 15km/h

= 1 1/3 hours (4/3 in mixed fraction)

Answer:

Measurement is the competion of known quantity to unknown quantity.

Explanation:

I hope that it will be right answer

Answer:

Measurement standard is relationship of a physical quantity.

Explanation:

Measurement standard is the fundamental reference and measuring the compared the device, these reference is controlled to the objects conditions to the physical quantity.

Answer:

2.38 T

Explanation:

Since the number of coils and the change in time are both 1, I set it up as 3.57=1.50(x) and then solved for x to be 2.38 T.

time (t) = 45 sec

Speed (v) = 14 m/s

mass (m) = 5kg

F = Force

F = m*a

a = acceleration = Δv / Δt = 14m/s / 45 s = 0.31 m/s^2

F = 5 kg * 0.31 m/s^2 = 1.56 kgm/s^2 = 1.56 N

Answer:

positions of motion is the answer as moving is a motion

Answer:

232 N

Explanation:

By Hooke's law, the force applied to a spring is proportional to the stretch of the spring, so

F = kx

Where F is the force, k is the spring constant and x is how much it is stretched.

So, replacing k by 58N/cm and x by 4 cm, we get

F = (58 N/cm)(4 cm)

F = 232 N

Therefore, the force applied is 232 N

The electromagnet becomes weaker when the number of coils around the nail is decreased. The correct answer is "It becomes weaker."

An electromagnet is created by coiling a wire around a magnetic core, such as a nail, and running an electric current through the wire. This creates a magnetic field around the wire, which magnetizes the core.

The strength of the magnetic field and thus the strength of the electromagnet is directly proportional to the number of coils around the magnetic core.

This is because each coil adds to the magnetic field, and the more coils there are, the stronger the magnetic field becomes.

When some coils are removed, there are fewer coils contributing to the magnetic field. As a result, the strength of the magnetic field and thus the strength of the electromagnet decreases.

Therefore, the correct option is " it becomes weaker" when the number of coils around the nail is decreased.

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Answer:  1350 m/s

Explanation:

The equation for the speed of a wave: Speed = Wavelength x Frequency

Answer:

Q:

Two objects were lifted by a machine. One object had a mass of 2 kilograms, and was lifted at a speed of 2m/sec. The other had a mass of 4 kilograms and was lifted at a rate of 3 m/sec. Which object had more kinetic energy while it was being lifted?

A:

Kinetic energy = (1/2) (mass) (speed²)

First object: (1/2) (2 kg) (2 m/s)² = 4 joules .

Second object: (1/2) (4 kg) (3 m/s)² = 18 joules .

The second object had more kinetic energy than the first one had.

Explanation:

Inside a freely-falling elevator, there would be no apparent weight for you.So option B is correct.

Inside a freely-falling elevator, there is still a gravitational force acting on you. However, since both you and the elevator are falling at the same rate, you would experience a sensation of weightlessness. Your apparent weight, which is the force exerted on a body due to gravity, would be zero. This is because there is no contact force between you and the elevator floor that would provide a normal force to counteract gravity. Therefore, the correct option is that there would be no apparent weight for you.

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     Mach number is "the ratio of the speed of a body to the speed of sound in the surrounding medium" (Oxford Languages). Put simply, it's a ratio comparing the local flow velocity to the speed of sound in the medium.

     It is represented with the following formula. M is the mach number, u is the local flow velocity, and c is the speed of the sound in the medium.

                  \(\boxed{\displaystyle M=\frac{u}{c} }\)

The incandescent lamp was a major innovation in the field of lighting, allowing for brighter and more controllable light than previous lighting technologies.

The lamp worked by passing an electric current through a filament, which heated up and emitted light.

Thomas Edison's invention of the incandescent lamp in 1879 was a major breakthrough in lighting technology and had a significant impact on many industries, including theatre, film, and photography.

The incandescent lamp also had a profound effect on society, improving quality of life by enabling longer work hours and increased leisure time and spurring further technological advances in lighting and electricity.

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Answer:

Question 2

Part (a)

Chlorine:  type of compound = chloride

Oxygen:  type of compound = oxide

Part (b)

The iron reacts with water and oxygen to form rust.

A water molecule is made up of two hydrogen atoms joined to one oxygen atom:  Di-hydrogen oxide.

Question 3

This circuit is in parallel.

The current in a parallel circuit splits into different branches then combines again before it goes back into the supply.

We are told that A₁ = 0.8 A

As the lamps have equal resistance, the current splits equally:

A₂ = 0.4 A

A₃ = 0.4 A

Then combines again:

A₄ = 0.8 A

Answer: coal

Explanation:  Nonrenewable energy resources include coal, natural gas, oil, and nuclear energy. Once these resources are used up, they cannot be replaced, which is a major problem for humanity as we are currently dependent on them to supply most of our energy needs

Migrating low-pressure cells that move in the band of the westerlies is a typical feature of midlatitude cyclones in the eastern United States.

These cyclones are often associated with frontal boundaries, which form as an mT air mass collides with a cP air mass. The type of front is determined by which air mass is moving. As the cyclone progresses, rising warm air cools, resulting in cloud formation and rain. The intensity and track of these storms can have a significant impact on weather patterns, particularly during the winter months when they can bring significant snowfall to the region.
Hi! To answer your question about a typical feature of midlatitude cyclones in the eastern United States, the most characteristic feature is the migration of low-pressure cells that move in the band of the westerlies. These cyclones form when an mT (maritime tropical) air mass collides with a cP (continental polar) air mass. The type of front created is determined by which air mass is moving. As the warm air from the mT air mass rises, it cools, resulting in cloud formation and rain. Overall, these factors contribute to the development and behavior of midlatitude cyclones in the eastern United States.

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Answer:

The work done by Joel is greater than the work done by Jerry.

Explanation:

Let suppose that forces are parallel or antiparallel to the direction of motion. Given that Joel and Jerry exert constant forces on the object, the definition of work can be simplified as:

\(W = F\cdot \Delta s\)

Where:

\(W\) - Work, measured in joules.

\(F\) - Force exerted on the object, measured in newtons.

\(\Delta s\) - Travelled distance by the object, measured in meters.

During the first 10 minutes, the net work exerted on the object is zero. That is:

\(W_{net} = W_{Joel} - W_{Jerry}\)

\(W_{net} = F\cdot \Delta s - F\cdot \Delta s\)

\(W_{net} = (F-F)\cdot \Delta s\)

\(W_{net} = 0\cdot \Delta s\)

\(W_{net} = 0\,J\)

In exchange, the net work in the next 5 minutes is the work done by Joel on the object:

\(W_{net} = W_{Joel}\)

\(W_{net} = F\cdot \Delta s\)

Hence, the work done by Joel is greater than the work done by Jerry.

Answer:

The answer is D current

Explanation:

PLZ give brainliest if this helped

A meteorologist tries to forecast the weather by comparing the past and Current areas on a weather map.

Applying science and technology to forecast the weather is known as weather forecasting. It involves determining the atmosphere's state at a specific location and moment in time. Informally for thousands of years and formally since the 19th century, people have tried to predict the weather.

Weather predictions are created by gathering quantitative information on the status of the atmosphere, land, and ocean at a specific location and using meteorology to predict how the atmosphere will change there.

Weather forecasting is now based on computer-based models that consider various atmospheric parameters, as opposed to the past method of manually calculating changes in barometric pressure, current weather conditions, and sky condition or cloud cover.

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The magnitude of acceleration of the car is  1.70 \(m/s^{2}\) .

Acceleration is the rate of change of velocity with respect to time.

Mass of the car = 711 kg

Force exerted by the Student 1 = \(F_1\) =  638 N

Force exerted by the Student 2 = \(F_2\) =  573 N

Total force exerted on the car = F  = \(F_1\) + \(F_2\)

F = 638 + 573

F = 1,211 N

As we know that, Force is the product of mass and acceleration i.e.

F = m * a

\(a = \frac{F}{m}\)

a = \(\frac{1211}{711}\)

a = 1.70 \(m/s^{2}\)

The magnitude of acceleration of the car is  1.70 \(m/s^{2}\) to push it to a car mechanic.

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Answer:24

Explanation:u just get good sum idek

Answer:

The work done will be "43,200 J".

Explanation:

The given values are:

Force,

F = 720 N

Distance,

S = 60 m

Time,

t = 30 sec

As we know,

⇒  \(Work \ done=Force\times Distance\)

On substituting the values, we get

⇒                     \(=720\times 60\)

⇒                     \(=43,200 \ J\)

Answer:

a. 25.80 m

b. 4.59s

Explanation:

(refer to attached for reference)

Part a :

We are asked to find the distance the ball rises "s"

The relevant equation of motion is:

v² = u² + 2as,

Given:

Initial speed, u = 22.5 m/s

As the ball rises, we can also deduce the following:

1) the ball rises to a maximum height before it starts falling again. At the point of maximum height, for a split second, speed of the ball is zero.

Hence we can deduce that final speed, v = 0 m/s

2) the only acceleration acting on the ball as it travels is gravity acting downward. Hence the acceleration that the ball experiences is equal to negative gravitational acceleration, i.e a = - 9.81 m/s²

Simply substitute the above values into the equation above and solve for distance "s"

v² = u² + 2as

0² = 22.5² + 2(-9.81)s

19.62s = 22.5²

s = 22.5² / 19.62 = 25.80 m (answer)

Part b:

We are asked to find how long the ball takes to rise and fall again before it is caught. We are also told that the time for the ball to rise is the same as the time for the ball to fall. Hence all we need to do is find the time taken for the ball to rise and then multiply that by 2 to get our answer.

In this case, the relevant equation of motion is:

v = u + at, where t is the time taken for the ball to rise.

simple substitute the above known values into this equation and solve for t

v = u + at

0 = 22.5 + (-9.81)t

9.81t = 22.5

t = 22.5/9.81

t = 2.29 s

hence the time taken to rise AND fall = 2t = 2(2.29) = 4.59s (answer)

The ball will rise to the height of 25.8 meters and the ball will remain in air for 4.5 seconds for both rise and fall of the ball.

In the field of physics, the idea and practice of motion are crucial. Numerous words and elements are important to the motion. Such as length, breadth, depth, velocity, and so forth. Static or variable velocity is a property of moving things. Thus, if the motion is accelerating, the initial velocity and the ultimate velocity may differ. The pace at which an object's position changes in relation to time is known as its velocity.

According to the question, the given values are :

Initial Speed, u = 22.5 m/s

Final Speed, v = 0 m/s

Acceleration, a = -9.8 m/s²

Use equation of motion :

v = u + at

0 = 22.5 + (-9.8)(t)

t = 22.5 / 9.8

t = 2.2 seconds.

(a) The height rise of the ball will be :

s = ut + 1/2 at²

s = 22.5(2.2) + 1/2(-9.8)(2.2)²

s = 49.5 - 23.71

s = 25.8 meters.

(b) The time that the ball remain in the air :

2(t) = 2 (2.2)

= 4.4 seconds.

Hence, the ball will cover a distance of 25.8 meters and the time it will be in the air is 4.4 seconds.

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Answer:

homo 1 3 hetero 2 4

Explanation:

Answer:

a)  Ua> Ub,  b) Em = K + U

Explanation:

A swing is an oscillatory system, which goes from the highest point of the trajectory to the lowest point and then continues to the highest point on the other side, with a curved trajectory.

Suppose point A is the highest point and point A the lowest point, as the potential energy is given by the formula

              U = m g h

if we define a reference system where the lowest point corresponds to y = or at this point the power energy is zero, therefore

              Ua> Ub

in this movement the mechanical or total energy of the system remains constant, therefore it can be written

            Em = K + U

therefore at the highest point the mechanical energy is only potential and at the lowest point it is only kinetic and at the intermediate points it has a part of each, but the value of the mechanical energy is constant and does not change.

Answer:

At which position, A or B, is the potential energy of the swing the greatest?

b

As the swing moves from point B to point A, which form of energy is increasing, kinetic or potential?

kinetic

Explanation:

Hi there!

This is an example of Uniform Circular Motion, thus:

Net Force = Centripetal force

∑F = mv²/r

Plug in the given values. Remember to convert from diameter to radius, first.

d = 199m

r = d/2 = 199/2 = 99.5 m

∑F = 1336(22²)/99.5 = 6498.73 N

Displacement is the movement of unfavorable emotions from one thing or person to another.

As a kind of self-preservation, displacement is the act of shifting one's unfavorable emotions from one thing or person to another.

According to the notion, releasing stress or worry on a non-threatening target helps a person deal with negative emotions like fear or rage.

For instance, if a person feels angry because their boss yells at them, they might project those feelings onto someone or something else, such a member of their family or a piece of furniture.

For fear of losing their work, the person could feel unable to face their manager. As a result, they might vent their rage on a less dangerous person like their partner or housemate.

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Answer: True

Explanation: Light enters your eye through the lens which then hits the retina which is located in the back of your eye.