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  26. A 70-kg man standing in a 20-kg boat. The

Question :   26. A 70-kg man standing in a 20-kg boat. The : 2102137

 

26. A 70-kg man is standing in a 20-kg boat. The man steps to the right thinking he is stepping out onto the dock. However, the following will actually happen (ignore the friction of the water or air on the boat or the man):

A. The man only moves a short distance to the right while the boat moves a larger distance to the left.

B. The man actually stays still while the boat moves toward the left.

C. The boat doesn't move and the man moves to the right.

D. None of the above.

27. A lump of clay is thrown at a wall. A rubber ball of identical mass is thrown with the same speed toward the same wall. Which statement is true?

A. The clay experiences a greater change in momentum than the ball.

B. The ball experiences a greater change in momentum than the clay.

C. The clay and the ball experience the same change in momentum.

D. It is not possible to know which object has the greater change in momentum.

28. A high-diver of mass 70 kg jumps off a board 10 m above the water. If, 1.0 s after entering the water his downward motion is stopped, what average upward force did the water exert?

A. 100 N

B. 686 N

C. 980 N

D. No answer is correct.

29. Object 1 has twice the mass of Object 2. Both objects have the same kinetic energy. Which of the following statements is true?

A. Both objects can have the same magnitude of momentum.

B. Object 1 has a momentum of greater magnitude than Object 2.

C. The magnitude of the momentum of Object 2 is four times that of Object 1.

D. All the statements are false.

30. Object 1 has twice the mass of Object 2. Each of the objects has the same magnitude of momentum. Which of the following statements is true?

A. Both objects can have the same kinetic energy.

B. One object has 0.707 times the kinetic energy of the other.

C. One object has twice the kinetic energy of the other.

D. One object has 4 times the kinetic energy of the other.

 

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