# pt41 - Physics 101 FORM 0[l You drop a stone from a bridge...

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Physics 101 FORM 0 [l.] You drop a stone from a bridge to the river below. After this stone has traveled a distance d, you drop a second stone. The distance between the two stones (while they are freely falling) will always <fAl'lincrease [B] decrease [e] stay constant liST increase at first, but then stay constant [El decrease at first, but then stay constant [2J Person A walks 6.0 m at an angle of 30° north of east. Person B walks 7.0 m at an angle of 42° west of north. How does the component of the displacement of person A along the north direction compare with the component of the displacement of person B along the ~th direction? ~It is smaller. [B] It is larger. [e] They are equal. [n] There is not sufficient information to tell. . [El The question is physically meaningless. [3J At what angle above the horizontal must a projectile with an initial velocity of 400 m/s be fired so that its totalr.~ht time is 52.5 s? (2sinxcosx = sin(2x).) [A] 15° [B] 25° ~40° [n] 60° [El none of these [4J A 3.0-kg and a 5.0-kg box rest side-by-side on a smooth level floor. A horizontal force of 32 N is applied to the 5.0-kg box pushing it against the 3.0-kg box, and, as a result, both boxes slide along the floor~ow large is the contact force between the two boxes? [A] 0 N [B]lO N @12 N [n] 20 N [EJ 32 N [5] As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is [A] kinetic friction. @static friction. [e] a combination of statIc and kinetic friction. [n] neither static nor kinetic friction, but some other type of friction. [EJ It is impossible to tell what type of friction acts in this situation. [6] A 600-kg car is going around a banked curve with a radius of 110.0 m at a speed of 24.5 m/s. What is the appropriate banking angle so that the car stays on its path without the assistance of friction? [AJ 15.3° @»29.l o [e] 33.8° [n] 56.2° [E] 60.9 0 [7] A l.O-kg object moving in a certain direction has a kinetic energy of 2.0 J. It hits a wall and comes back with half its original speed. What is the kinetic energy of this object at this point? @0.50 J [B]l.O J [e] 2.0 J [n] 4.0 J [El 8.0 J

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Physics 101 FORM 0 [8] A lightweight object and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater height? [A] The heavy object, because it has greater kinetic energy. [B] The light object, because it has smaller kinetic energy. [e] The lightweight object, because it weighs less. [J2J
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pt41 - Physics 101 FORM 0[l You drop a stone from a bridge...

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