What is the spring constant of a spring that stores of elastic potential energy when compressed by ?
Spring constant is, .
Elastic potential energy
Compressed length .
The problem is based on the concept of elastic potential energy. It is energy stored as a result of applying a force to deform an elastic object. By using the concept of elastic potential energy, we can find the spring constant.
Elastic potential energy can be written as
Substitute all the value in the above equation.
Hence the spring constant is, .
A collie drags its bed box across a floor by applying a horizontal force of 8.0 N . The kinetic frictional force acting on the box has magnitude 5.0 N . As the box is dragged through 0.70 m along the way, what are (a) the work done by the collie’s applied force and (b) the increase in thermal energy of the bed and floor?
In Fig. 8-55, a block slides along a path that is without friction until the block reaches the section of length L = 0.75 m, which begins at height h = 2.0 m on a ramp of angle . In that section, the coefficient of kinetic friction is 0.40. The block passes through point A with a speed of 8.0 m/s . If the block can reach point B (where the friction ends), what is its speed there, and if it cannot, what is its greatest height above A?
In Fig 8.54, a block slides along a track from one level to a higher level after passing through an intermediate valley. The track is frictionless until the block reaches the higher level. There a frictional force stops the block in a distance d. The block’s initial speed , the height difference h is 1.1 m, and . Find d.
In Fig.8.51, a block slides down an incline. As it moves from point A to point B, which are 5.0 m apart, force acts on the block, with magnitude 2.0 N and directed down the incline. The magnitude of the frictional force acting on the block is 10 N . If the kinetic energy of the block increases by 35 J between A and B, how much work is done on the block by the gravitational force as the block moves from A to B?
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