A crate of mass 50.0 kg slides down a 60.0o incline. The crates acceleration is 4.00...

A crate of mass 50.0 kg slides down a 60.0^o incline. The crates acceleration is 4.00 m/s², and the incline is 10.0 meter long. a) What is the kinetic energy of the crate as it reaches the bottom of the incline? b) How much work is spent in overcoming friction? c) What is the magnitude of friction force that acts on the crate as it slides down the incline?
An advertisement claims that a certain 1200kg car can accelerate from rest to a speed of 25.0 m/s in a time of 8.00 s. (a) What is the change in kinetic energy during 8.00 s? (b) What is the impulse of this car in a time of 8.00 s (c) What is the power of its motor to produce such acceleration? Ignore friction and drag forces.
A playground merry-go-around is a metal disk of radius 2.50 m and mass of 80.0kg. Two kids, each of mass 40.0 Kg are riding on the outer rim of the disk. When they move halfway in toward the center (radius 1.25m), by what factor does the moment of inertia change?

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genius_generous answered 1 year ago

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