Speedboat A negotiates a curve whose radius is 120 m. Speedboat B negotiates a c

Question

Speedboat A negotiates a curve whose radius is 120 m. Speedboat B negotiates a curve whose radius is 240 m. Each boat experiences the same centripetal acceleration. What is the ratio v_A/v_B of the boats? You are riding on a bumper car going 1 m/s. You hit another car and after the collision you are moving backwards at 2 m/s. If your car has a mass of kg and the other car has a mass of 400 kg and collision is perfectly elastic (no energy loss). How fast was the other car moving before the collision An astronaut is on a spacewalk outside a spaceship. The spaceship has a mass of 10000 kg and the astronaut has a mass of 50 kg. If she is 10 m away from the spaceship, a) what is the gravitational force on the astronaut b) what is the acceleration of the astronaut? A woman holds a 2 m long pole at one end, with her hands 30 cm apart. The pole is uniform and has a mass of 10 kg. Determine the force she must exert with each hand (both magnitude and direction)?

Explanation / Answer

1 )

the can be used is a = V2 / R

then can write

VA2 / 120 = VB2 / 240

VA2 / VB2 = 120/ 240

VA / VB = 0.51/2

VA / VB = 0.7071

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2 )

using equation

m1 u1 + m2 u2 = ( m1 + m2 ) V

V = m1 u1 + m2 u2 / ( m1 + m2 )

V = 300 X 1 + 400 X 2 / ( 300 + 400 )

V = 1.571 m/sec

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