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26. When an object dropped from a tower, what the
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Question :   26. When an object dropped from a tower, what the : 2102120

26. When an object is dropped from a tower, what is the effect of the air resistance as it falls?

A. does positive work

B. increases the object's kinetic energy

C. increases the object's potential energy

D. None of the above choices are valid.

27. Samantha pushes a 50-N crate up a ramp 25.0 m in length and inclined at 10? with the horizontal. What potential energy change does the crate experience?

A. 13 J

B. 55 J

C. 120 J

D. 220 J

28. A 15.0-kg crate, initially at rest, slides down a ramp 2.0 m long and inclined at an angle of 20? with the horizontal. If there is no friction between ramp surface and crate, what is the kinetic energy of the crate at the bottom of the ramp? (g = 9.8 m/s2)

A. 220 J

B. 690 J

C. 10 J

D. 100 J

29. A 10.0-kg box starts at rest and slides 3.5 m down a ramp inclined at an angle of 10? with the horizontal. If there is no friction between the ramp surface and crate, what is the velocity of the crate at the bottom of the ramp? (g = 9.8 m/s2)

A. 6.1 m/s

B. 3.5 m/s

C. 10.7 m/s

D. 8.3 m/s

30. A baseball catcher puts on an exhibition by catching a 0.15-kg ball dropped from a helicopter at a height of 101 m. What is the speed of the ball just before it hits the catcher's glove 1.0 m above the ground? (g = 9.8 m/s2 and ignore air resistance)

A. 44 m/s

B. 38 m/s

C. 31 m/s

D. 22 m/s

Solution 5 (1 Ratings )

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Physics 1 Year Ago 90 Views