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A rescue helicopter lifts a 90-kg person straight up by means of a cable. The person has an upward acceleration of 0.70 m/s2 and is lifted from rest through a distance of 13 m.
(a) What is the tension in the cable?
N
(b) How much work is done by the tension in the cable?
J
(c) How much work is done by the person's weight?
(d) Use the work-energy theorem and find the final speed of the person.
m/s
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Assume that the temperature of the bullet doesn't change appreciably, how much ice is melted as a result of the collision.
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what is the minimum acceleration necessary for the plane to take flight.
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Explain how much mechanical energy is lost due to friction acting on the runner? How far does he slide?
What is the size of the frictional force acting on the car
A scientific supply catalog advertises a material having the index of refraction of 0.85. Is that a better product to buy? Why or why not.
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