1, A small ball, mass = 0.60 kg, at the end of a string is whirled in a vertical circle of radius = 60 cm with a tangential velocity of 8.0 m/s. (a) What is the tension in the string when it is at the bottom of the circle? (b) What is the tension in the string when it is at the top of the circle? (c) What is the critical velocity
1, A small ball, mass = 0.60 kg, at the end of a string is whirled in a vertical circle of radius = 60 cm with a tangential velocity of 8.0 m/s. (a) What is the tension in the string when it is at the bottom of the circle? (b) What is the tension in the string when it is at the top of the circle? (c) What is the critical velocity?
2, A cement truck, mass = 2000 kg, has an engine which produces 4000 N. The truck develops a leak and loses cement at a rate of 10 kg/sec, (a) The truck starts from rest and accelerates when the light turns green. What is its initial acceleration? (b) What is the equation for the acceleration as a function of time? (c) What is the equation for the velocity as a function of time? (d) How long will it take the cement truck to get up to a velocity of 15 m/s?
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