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# HW 7 - HW 7 1 A railroad flatcar of weight 7840 N can roll...

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HW 7 1) A railroad flatcar of weight 7840 N can roll without friction along a straight horizontal track. Initially, a man of weight 596 N is standing on the car, which is moving to the right with speed 25 m/s ; see the figure. What is the change in velocity of the car if the man runs to the left so that his speed relative to the car is 8.0 m/s ? 2) A 1300 kg cannon, which fires a 90 kg shell with a speed of 536 m/s relative to the muzzle, is set at an elevation angle of 39° above

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the horizontal. The cannon is mounted on frictionless rails, so that it recoils freely. A. What is the speed of the shell with respect to the Earth? B. At what angle with the ground is the shell projected? 3) A bullet of mass 7.0 g is fired horizontally into a 2.6 kg wooden block at rest on a horizontal surface. The coefficient of kinetic friction between block and surface is 0.45. The bullet comes to rest in the block, which moves 2.00 m . A. What is the speed of the block immediately after the bullet comes to rest within it?
B. At what speed is the bullet fired? 4) After a completely inelastic collision, two objects of the same mass and same initial speed are found to move away together at 0.54 times their initial speed.

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