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A teenager pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a frequency of 12 in 9.9 . Assume the merry-go-round is a uniform disk of radius 2.3 and has a mass of 740 , and two children (each with a mass of 27 ) sit opposite each other on the edge.
a) Calculate the torque required to produce the acceleration, neglecting frictional torque.
b) What force is required at the edge?
A 1 000-kg experimental rocket sled on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20-s "burn." what impulse is experienced by the rocket sled
Block A has a mass of 2 kg and rests on a smooth table. What is the acceleration in m/s2 of the two blocks
3 amperes of current flow through a wire. What net charge flows past a point in the wire each second
A lead ball, with an initial temperature of 25oC, is released from a height of 101.0 m. It does not bounce when it hits a hard surface. Presume all the energy of the fall goes into heating the lead. Find the temperature (in degrees C) of the ball ..
The convex lens of a copy machine has a focal length of 25.0cm. A letter to be copied is placed 40.0cm from the lens. How far from the lens is the copy paper located? The machine was adjusted to give an enlarged copy of the letter. How much larger wi..
A 1.5 m cylinder of radius 1.1 cm is made of a complicated mixture materials. Its resistivity depends on the distance x from the left and obeys the formula p(x)=a+bx^2, What is the resistance of the rod
A 89.1-kN car is travelling at 73.1 mph when the driver decides to exit the freeway by going up a ramp. What is the magnitude of the average drag force exerted on the car
A metal wire has a resistance of 8.00 at a temperature of 20°C. If the same wire has a resistance of 10.85 at 90°C, what is the resistance of the wire when its temperature is -20°C
A test rocket is launched, starting on the ground, from rest, by accelerating it along an incline with constant acceleration "a", what is the position vector when the rocket is at its highest point
A gallon of gasoline contains about 1.3x10^8 joules of energy. A 2000-kg car traveling 20 m/s skids to a stop. Estimate how much gasoline it will take to bring the car back to the original speed
A gas is enclosed in a cylinder fitted with a light frictionless piston and maintained at atmospheric pressure. Calculate the change in internal energy of the gas
Years ago, a block of ice with a mass of about 19.0 kg was used daily in a home icebox. The temperature of the ice was 0.0°C when it was delivered. how much heat did a block of ice absorb
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