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A barefoot field-goal kicker imparts a speed of 49 m/s to a football initially at rest. If the football has a mass of 0.76 kg and the time of contact with the ball is 0.014 s, what is the force exerted by the ball on the kicker's foot?
Answer in units of N
As part of a safety investigation, two 1200 {rm kg} cars traveling at 24 {rm m/s} are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.80 {rm s} to stop, and (b) car that hits a..
A solid sphere of uniform density starts from rest and rolls without slipping a distance of d = 4 m down a q = 28° incline. The sphere has a mass M = 5.2 kg and a radius R = 0.28 m. What is the magnitude of the frictional force on the sphere?
At the bottom of the sea a small hole developed at the body of a submarine. at what speed the water is entering into submarine
A 40kg child slides down a frictionless playground slide, starting from rest at a height of 2.2 m. He leaves the bottom of the slide moving horizontally at some velocity(v1). What is the distance the two roll to before stopping
If a woman lifts a 20.0 kg bucket from a well and does 6.00 kJ of work, how deep is the well? Suppose that the speed of the bucket remains constant as it is lifted.
If I end up with a velocity of 1 m/s going west, am I heaver or lighter than you? What is your mass, and what is your final velocity?
A man wolks up a flight of stair, his power output is P. he runs up the same stairs with twice the speed. What's new power output
A crane at a construction site lifts a concrete block with a mass of 440 kg from the ground to the top of a building with a height of 15.0 m
A merry-go-round accelerates from rest to 0.78rad/s in 34 s. Assuming the merry-go-round is a uniform disk of radius 7.0 m, calculate the net torque required to accelerate it
A large tanker truck can carry 30 ton (30,000 lb) of liquid. (a) What volume of water can it carry? (b) What volume of gasoline can it carry.
A ball is launched from a height of 7.94 ft above the ground with a speed of 16.95 m/s at an angle of 34.48 degrees from the horizontal
Discuss the functions of a thermoflask in terms of conduction, convection, and radiation. What improvements would you add to a modern day thermoflask
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