Question

The figure below shows an object with a mass of m = 7.40 kg that starts...

The figure below shows an object with a mass of m = 7.40 kg that starts from rest at point A and slides on a track with negligible friction. Point A is at a height of 5.90 m, point B is at a height of 3.2 m, and point C is at a height of 2.0 m.

(a) What is the object's speed at 3.2 m (in m/s)?

What is the object's speed at 2.0 m (in m/s)?

(b) What is the net work (in J) done by the gravitational force on the object as it moves from point A to point C? J

0 0
Add a comment Improve this question Transcribed image text
Answer #1

Applying conservation of energy between point A and B,

7.4xgx5.9 = 1/2x7.4xv2 + 7.4xgx3.2

873.2 = 7.4v2 + 473.6

v = 7.34 m/s

the problem can also be solved by using laws of motion,

to find velocity at C, which has come down to a height of 2 meter, it means it has travelled by 5.9-2 =3.9 m

so, v2 = 2gh = 20x3.9 =

v = 8.83 m/s

Work done by gravity when it moves from A to C = mxgx(5.9-2) = 288.6 joule

Add a comment
Know the answer?
Add Answer to:
The figure below shows an object with a mass of m = 7.40 kg that starts...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions
  • + -/1.66 points My Notes SerCP11 5.6.OP.036 5. The figure below shows a box with a...

    + -/1.66 points My Notes SerCP11 5.6.OP.036 5. The figure below shows a box with a mass of m friction. Point A is at a height of h 7.10 kg that starts from rest at point A and slides on a track with negligible = 7.00 m A 3.20 m 2.00 m (a) What is the box's speed at point B (in m/s)? m/s What is the box's speed at point C (in m/s)? m/s (b) What is the net...

  • A block of mass m = 7.40 kg is released from rest from point and slides...

    A block of mass m = 7.40 kg is released from rest from point and slides on the frictionless track shown in the figure below. (Let h_a = 5.20 m.) Determine the block's speed at points Where is the energy stored at point A? Where is the energy stored at point B? m/s Determine the net work done by the gravitational force on the block as it moves from point to point

  • 8.2 A block of mass m = 5.10 kg is released from rest from point and...

    8.2 A block of mass m = 5.10 kg is released from rest from point and slides on the frictionless track shown in the figure below. (Let ha = 7.40 m.) (a) Determine the block's speed at points and . vB =  m/s vC =  m/s (b) Determine the net work done by the gravitational force on the block as it moves from point to point . J

  • A block of mass m = 6.20 kg is released from rest from point and slides...

    A block of mass m = 6.20 kg is released from rest from point and slides on the frictionless track shown in the figure below. (Assume ha = 6.10 m.) Determine the block's speed at points and point m/s point m/s Determine the net work done by the gravitational force on the block as it moves from point to point J

  • 0,2gm A particle of mass : 3 kg starts from rest at point A and slides...

    0,2gm A particle of mass : 3 kg starts from rest at point A and slides around the frictton- less loop-the-loop DBC. Use g 10 m/s2 0,2 a Find the speed of the article at point E. R 1690 Find the-magnitude and direction of the acceleration of the particle at B. Be sure to include the angle between the acceleration vector and the horizontal. Pind the normal force exerted by the track on the particle at-c. (d) After going around...

  • A block of mass m= 7.30 kg is released from rest from point and slides on...

    A block of mass m= 7.30 kg is released from rest from point and slides on the frictionless track shown in the figure below. (Acum , -7.50m) and (a) Determine the block's speed at points point point m/s to point (b) Determine the network done by the gravitational force on the block as it moves from point

  • A block of mass m = 7.50 kg is released from rest from point and slides...

    A block of mass m = 7.50 kg is released from rest from point and slides on the frictionless track shown in the figure below. (Let ha-6.10 m.) ha 3.20 m 2.00 m (a) Determine the block's speed at points ) and vg= YC= m/s m/s (b) Determine the net work done by the gravitational force on the block as it moves from point to point C

  • A small block of mass m slides along the frictionless loop the loop track shown below....

    A small block of mass m slides along the frictionless loop the loop track shown below. If it starts from rest at point A, what is the speed of the block at point B? (v = squareroot (10 g R)) What is the net force acting on the block at point C? (Don't forget the gravitational force. (F = -mg (8i + j) At what height above the bottom should the block be released so that the normal force exerted...

  • A force moves an object in the direction of the force. The graph shows the force...

    A force moves an object in the direction of the force. The graph shows the force versus the object's position (a) Find the work done when the object moves from 0 to 2.0 m. (b) If the mass of this object is 1.5 Kg and it started from rest find the final velocity at 2.0 m.

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT