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Q. A 78 kg circus performer jumps from a 4.2 m height onto a trampoline and stretches it downward 0.30 m. Assume that the trampoline obeys Hooke's law.
(a) How far will it stretch if the performer jumps from a height of 8.3 m?
(b) How far will the trampoline stretch if the performer stands still on it while taking a bow?
Q. Identify the action-reaction pairs when a baseball is being hit.
(a) ball hits a bat, bat hits the player(b) ball hits bat, bat pushes the arm of the player(c) bat hits ball, ball hits bat(d) bat hits ball, ball hits the player(e) none of these
A horse races once around a circular track in a time of 118s, with a speed of 17 m/s. What is the radius of the track? How do you go about solving this.
A college campus features a large fountain surrounded by the circular pool. Two students start at the northernmost point of pool and walk slowly around it in opposite directions.
A sound wave traveling at 341m/s is emitted by foghorn of a tugboat. An echo is heard 3.30s later.
What is tension in the cord
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A weight (with a mass of 90 kg) is suspended from the point near the right-hand end of a uniform boom with a mass of 71kg. To support the uniform boom a cable runs from this same point to a wall (the left-hand vertical coordinate) and by a pivot on t..
Eight lights are connected in parallel to a 116 V source by two leads of total resistance 1.1. If 240 mA flows through each bulb, what is the resistance of each? What fraction of the total power is wasted in leads.
A hockey player is standing on his skates on the frozen pond when an opposing player, moving with a uniform speed of 13 m/s, skates by with the puck. After 2.5 s, the first player makes up his mind to chase his opponent.
A race car has a mass of 718 kg. It starts from rest and travels 45.0 m in 3.0 s. The car is uniformly accelerated throughout the entire time. What net force is exerted on it.
A girl sits fixed on a merry-go-round of mass M = 500 kg and radius R = 2 m. The merry-go-round is at first at rest and is free to rotate without friction.
suppose the radius of the ball is very small compared to other length scales in the problem. Take starting level as step 0, the next step down as step 1, and so on.
Assuming the diver has inhaled a negligible amount of air from the tank, what is the temperature of the ocean water.
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