A box is sliding down an incline tilted at a 12.0° angle above horizontal. The box is initially sliding down the incline at a speed of 1.50 m/s. The coefficient of kinetic friction between the box and the incline is 0.340
How far does the box slide down the incline before coming to rest?
A) 0.920 m
B) 2.33 m
C) 1.78 m
D) 0.720 m
E) The box does not stop. It accelerates down the plane.
Answer: A
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A. are equal in magnitude and opposite in direction and act on the same object. B. are equal in magnitude and opposite in direction and act on different objects. C. appear in a free-body diagram for a given object. D. always involve gravitational force as one partner. E. act in the same direction on the same object.
A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is
A) 30 hertz and it travels at 60 m/s. B) 60 hertz and it travels at 30 m/s. C) 1800 hertz and it travels at 2 m/s. D) none of the above
A block is placed in oscillation on a frictionless horizontal surface attached to a spring that requires 125 N for the block to be stretched 15 cm away from equilibrium. From this position it is released, and oscillates with a period of 0.25 s. What is the mass of the block?
A. 0.66 kg B. 4.1 kg C. 1.3 kg D. 5.3 kg
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