What is the mass of an object if it is moving, №17887269, 16.07.2021 10:54

Physics

What is the mass of an object if it is moving at a speed of 10 m/s and has 400 J of kinetic energy?

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P Answered by PhD

1

Answers:

8 kg

Explanation:

Kinetic Energy = (mass × velocity × velocity) ÷ 2

We know that Kinetic Energy = 400 J and velocity = 10 m/s.

KE = (m × v × v) ÷ 2

400 J = (m × 10 m/s × 10 m/s) ÷ 2

400 J = m × 50 m^2/s^2

To find the mass you will divide 400 J and 50 m^2/s^2.

m = 8 kg

You can also check it if it gives you 400 J.

KE = (m × v × v) ÷ 2

KE = (8 kg × 10 m/s × 10 m/s) ÷ 2

KE = 400 J

So this means that the mass is 8 kg. I know that it is a bit confusing, but when you do J (joules) ÷ m^2/s^2 = kg (kilograms). Hope this helps, thank you !!

Physics

A student athlete is participating in the hammer throw. The student rotates in uniform circular motion with the mass rotating 2.3 m away from the center of rotation. Refer to the information and diagram shown above. The student athlete can rotate so that the object is moving with a speed of 10 m/s. What is the acceleration necessary to keep the object in uniform circular motion?

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P Answered by PhD

1

The acceleration necessary to keep the object in uniform circular motion is 43.48 m/s²

From the question given above, the following data were obtained:

Radius (r) = 2.3 mVelocity (v) = 10 m/sAcceleration (a) =?

The acceleration required to keep the object in circula motion can be obtained as follow:

a = v² / r

a = 10² / 2.3

a = 100 / 2.3

a = 43.48 m/s²

Thus, the acceleration required to keep the object in circula motion is 43.48 m/s².

Learn more about centripetal acceleration: link

Physics

A student athlete is participating in the hammer throw. The student rotates in uniform circular motion with the mass rotating 2.3 m away from the center of rotation. Refer to the information and diagram shown above. The student athlete can rotate so that the object is moving with a speed of 10 m/s. What is the acceleration necessary to keep the object in uniform circular motion?

Step-by-step answer

P Answered by PhD

1

The acceleration necessary to keep the object in uniform circular motion is 43.48 m/s²

From the question given above, the following data were obtained:

Radius (r) = 2.3 mVelocity (v) = 10 m/sAcceleration (a) =?

The acceleration required to keep the object in circula motion can be obtained as follow:

a = v² / r

a = 10² / 2.3

a = 100 / 2.3

a = 43.48 m/s²

Thus, the acceleration required to keep the object in circula motion is 43.48 m/s².

Learn more about centripetal acceleration: link

Social Studies

Will give brainliest to who ever first what happens to an object when it is already moving and you exert even more force on it in the same direction it is moving? question 1 options: the object will speed up. the object will slow down. the object will stop moving. the object will change direction. question 2 (1 point) what will happen to an object when you apply a force that is in the opposite direction than it is already moving? question 2 options: it will speed up it will show down it will start moving it will stop moving question 3 (1 point)

Step-by-step answer

P Answered by PhD

3

Sorry but I don't know all of them.

I'm not sure about the ones i wrote either

1. The object will speed up

2. It will slow down/ or stop

Social Studies

Will give brainliest to who ever first what happens to an object when it is already moving and you exert even more force on it in the same direction it is moving? question 1 options: the object will speed up. the object will slow down. the object will stop moving. the object will change direction. question 2 (1 point) what will happen to an object when you apply a force that is in the opposite direction than it is already moving? question 2 options: it will speed up it will show down it will start moving it will stop moving question 3 (1 point)

Step-by-step answer

P Answered by PhD

3

Sorry but I don't know all of them.

I'm not sure about the ones i wrote either

1. The object will speed up

2. It will slow down/ or stop

Physics

Question 1 According to the Law of Conservation of Energy, why does the first hill on a roller coaster always have to be the tallest of all the other hills? Question 2 A single marble is placed at the top of a hill. The initial potential energy of the marble is 550 J. The marble slides down the hill. You take a picture of the marble at some point as it is down the hill. Without knowing the speed, the mass or the position of the marble, which of the following could be the only possible correct energies of the marble at this point? Assume no friction

Step-by-step answer

P Answered by Master

4

Dang that’s a lot wait i will answer in comments

Physics

Question 1 According to the Law of Conservation of Energy, why does the first hill on a roller coaster always have to be the tallest of all the other hills? Question 2 A single marble is placed at the top of a hill. The initial potential energy of the marble is 550 J. The marble slides down the hill. You take a picture of the marble at some point as it is down the hill. Without knowing the speed, the mass or the position of the marble, which of the following could be the only possible correct energies of the marble at this point? Assume no friction

Step-by-step answer

P Answered by Master

4

Dang that’s a lot wait i will answer in comments

Physics

PLZ HELP FAST Question 1 (3 points) Which is an example of gravitational potential energy only? Question 1 options: An elevator moving up to the 3rd floor. A skateboard rolling down a hill. A puppy walking in circles under a tree. An apple resting on the teacher s desk. Question 2 (3 points) How can you increase the gravitational potential energy (GPE) of an empty shoe box on the middle shelf of a bookcase? Question 2 options: Add items to the box to increase its mass. Add items to the box and raise it to a higher shelf. All options listed here

Step-by-step answer

P Answered by PhD

4

1: an elevator moving up to the 3rd floor (gathering potential energy)

2: all options here will increase the GPE

3: the last option

4: just before it hits the ground and has reached a speed of 28 meters per second

5: turning a different direction while moving the same speed

6:a jogger getting faster after spotting a mountain lion behind him on the trail

7: I didn’t watch the lesson

8: at the top of the swinging path, when you are still for a moment just before falling again

9: I d+o)n#t k#n0”w

10: same as 9 sor=ry

Physics

PLZ HELP FAST Question 1 (3 points) Which is an example of gravitational potential energy only? Question 1 options: An elevator moving up to the 3rd floor. A skateboard rolling down a hill. A puppy walking in circles under a tree. An apple resting on the teacher s desk. Question 2 (3 points) How can you increase the gravitational potential energy (GPE) of an empty shoe box on the middle shelf of a bookcase? Question 2 options: Add items to the box to increase its mass. Add items to the box and raise it to a higher shelf. All options listed here

Step-by-step answer

P Answered by PhD

4

1: an elevator moving up to the 3rd floor (gathering potential energy)

2: all options here will increase the GPE

3: the last option

4: just before it hits the ground and has reached a speed of 28 meters per second

5: turning a different direction while moving the same speed

6:a jogger getting faster after spotting a mountain lion behind him on the trail

7: I didn’t watch the lesson

8: at the top of the swinging path, when you are still for a moment just before falling again

9: I d+o)n#t k#n0”w

10: same as 9 sor=ry

Physics

An object of mass 100 kg is initially at rest on a horizontal frictionless surface. at time t = 0, a horizontal force of 10 n is applied to the object for 1 s and then removed. which of the following is true of the object at time t = 2s if it is still on the surface? (a) it is at the same position it had at t 0, since a force of 10 n is not large enough to move such a massive object. (b) it is moving with constant nonzero acceleration. (c) it is moving with decreasing acceleration. (d) it is moving at a constant speed (e) it has come to rest some

Step-by-step answer

P Answered by PhD

1

(D) It is moving at a constant speed

Explanation:

Before t = 1s. Due to the force, albeit small, acting on the object, since there's no static friction stopping the object from moving, this mass object would have a constant acceleration and it's velocity would be increasing.

According to Newton's 1st law, an object will stay at a constant speed if the net force acting on it is 0. After t = 1s, horizontally speaking there's no other force exerting on the mass object. There is no friction force at play here as the surface is frictionless.

Therefore the correct statement is (D) It is moving at a constant speed

What is the mass of an object if it is moving at a speed of 10 m/s and has 400 J of kinetic energy?

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