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kinetic energy and potenital energy

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26. A block of mass m is initially moving to the right on a horizontal frictionless surface at a speed v. It then compresses a spring of spring constant k. At the instant when the kinetic energy of the block is equal to the potential energy of the spring, the spring is compressed a distance of:

27. A small object of mass m, on the end of a light cord, is held horizontally at a distance r from a fixed support shown. The object is then released. What is the tension in the cord when the object is at the lowest pont of its swing?

28. A block is released from rest at point P and slides along the frictionless track shown. At point Q, its speed is:

29. A rectangular block is moving along a frictionless path when it encounters the circular loop as shown. The block passes point 1, 2, 3, 4, 1 before returning to the horizontal track. At pont 3

30. a particle is release from rest at the point x = a and moves along the x axis subject to the potenital energy function U(x) shown. The particle

31. As a particle moves along the x axis it is acted by a conservative force. The potential energy is shown below as a function of the coordinate x of the particle. Rank the labeled regions according to the magnitude of the forest, least to greates

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26. A block of mass m is initially moving to the right on a horizontal frictionless surface at a speed v. It then compresses a spring of force constant k. At the instant when the kinetic energy of the block is equal to the potential energy of the spring, the spring is compressed a distance of :

The potential energy of the spring is , the block's kinetic energy is
The block's initial kinetic energy is
(1)
Since the block's kinetic energy is equal to the potential energy of the spring,

Substitute it to (1)

Answer A is correct.

27. A small object of mass m, on the end of a light cord, is held ...

Solution Summary

It provides detailed explainations of classical physics questions, such as spring-object and conserviation of energy. The work shown is detailed and received a '5/5' from the student who posted the questions.

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