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A 20-N weight is pushed up along a frictionless ramp making 30° with the horizontal to a height of 6m. Find the work done.
A 10-N block of wood is pulled along a straight line across a frictionless plane with a force of 5N parallel to the plane. If the block moves 2m find the work done.
At 12.00 currency unit per kilowatt hour (kWh) how much does it cost to operate a 10-hp motor for 8 hours?
An object is attracted towards the origin with a force given by F = 6x^3 . a) What is the force at (1,0)? b) what is the work done by the when the object moves from (1,0) to (2,0)?
A 5 kg package slides 2m down an incline of 53° above the horizontal. The coefficient of kinetic friction between package and incline is 0.4.
Calculate
a. The work done by friction on the package
b. The work done by gravity.
A ball moving at 1 m.s-1 strikes another ball twice the mass which is initially at rest.
The lighter ball bounces back at 0.5 m.s-1, its path making an angle of 30° with its
original path. Calculate the velocity of the heavier ball after impact.
Assume that the earth’s rate of rotation were increased to such an extent that the
apparent weight of an object on the equator was zero. What would then be the period
of rotation of the earth?
Radius of the earth = 6380 km
Calculate the kinetic energy of a neutron whose momentum is 200 MeV/c
A car slows from 23.69 m/s to rest in 4.44 s. How far did it travel in this time?
How long does it take for a ball dropped off of a building of height 69.2 m to hit the ground if the ball starts it's fall from rest?
