Physics Final Spring 2021 Question 11
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Q Review / Finish Test
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Question 11
A weightlifter presses a 200 N weight 0.5 m over his head in 2 s. What is the power of the weightlifter?
А
25 W
9
B
50 W
С
50 N
D
200N

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.