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A 200 g object is whirled in a horizontal circle with a cord of radius 1.2 m at 3rev/s. The work done in doing this is.
Which requires more work: (Body A) lifting a 50.0 kg crate a vertical distance of 2.0 meters; (Body B) lifting a 25.0 kg crate a vertical distance of 4.0 meters?
A 100 kg block is pulled at a constant speed of 5 m/s across a horizontal force by an applied force of 122 N directed 37 o above the horizontal. The rate at which the force does work on the block is.
Find the average horsepower, P =? required to raise a 150 kg drum to a height of 20 m in a time of 1 minute. SOLUTION: P = wk/t = mgH/t
You push against the rock with a force of F = 100N for t = 20 seconds. If the rock does not move d = 0, how much work have you done, Wk?
SOLUTION: Wk = F d cos 0
A car is proceeding down a 1 in 10 incline at 65kph when it’s brakes are abruptly applied. How far does it skid along the road before stopping is the wheels lock and the coefficient of friction between the tires and the road is 0.7?
A 60g bullet is fired at a target that presents an average resistive force to the passage of the bullet of 20kN per metre thickness of the material from which is constructed. If the bullet strikes the target at 600ms-1, what does the minimum thickness of the target have to be to stop the passage of the bullet completely?
A brass cube of side 10cm is heated through 30C.If the linear expansivity of brass is 2.0*10^-5K^-1 what is the increase in its volume
A metal rod of length 40.0cm at 20C is heated through a temperature of 45C.if the new length of the rod is 40.05cm calculate its linear expansivity
Two aeroplanes X and Y moving in space have positioned vectors 3i 4j 7k and -i 2j 3k in what direction should the pilot X look to see y.?
