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A railroad car of mass 3.4 x 104 kg moving at 4.00 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s.
(a) What is the speed of the three coupled cars after the collision?
_______m/s
(b) How much kinetic energy is lost in the collision?
______J
Speedboat A negotiates a curve whose radius is 124m. Speedboat B negotiates a curve whose radius is 230m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of boats.
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A gymnast with mass m1 = 49 kg is on the balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 126 kg and length L = 5 m. Each support is 1/3 of the way from each end. Initially the gymnast stands at the left en..
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Three polarizing plates whose planes are parallel are centered on a common axis. The directions of the transmission axes relative to common vertical direction.
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