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# Homework Problems-Ch07 Student Name: Phys 1052 Sec. ID No. Due Date: 28/04/2010 Note: Copeis are not accepted, any two copies involved will get ZERO....

The figure below shows the top view of two horizontal forces pulling a box along the floor:
(a) How much work was done by each force as the box displaced 70 cm along the broken line?
(b) If the box starts moving with an initial velocity of 2 m/s, what is its velocity after it displaced 70 cm along the broken line?
Page 1 /2 Homework Problems-Ch07 Student Name: ………………. Phys 1052 Sec. …. ... ID No. ……………… Due Date: Wed. 28/04/2010 Note: Copeis are not accepted, any two copies involved will get ZERO. P1. A box of mass 10 kg is pulled by a horizontal force of 50 N and moves with constant velocity a distance 5 m along a rough horizontal surface. Find a) the work done by friction. b) the work done by the force of gravity. P2 . The figure below shows the top view of two horizontal forces pulling a box along the floor: (a) How much work was done by each force as the box displaced 70 cm along the broken line? (b) If the box starts moving with an initial velocity of 2 m/s, what is its velocity after it displaced 70 cm along the broken line? 30 0 45 0 85N 60N
Page 2 /2 P3. A single force given by F x = 2 x + 4 acts on a block. Find the work done by this force to move the block from x = 2 m to x = 3 m. P4. A 10 kg block on a horizontal frictionless surface is attached to a light spring (force constant = 0.80 kN/m). The block is initially at rest at its equilibrium position when a force (magnitude P = 80 N) acting parallel to the surface is applied to the block, as shown. a) What is the speed of the block when it is 13 cm from its equilibrium position? b) If the displacement (13 cm) occurred in 10 seconds, what is the average power delivered to the block by the force P?

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