Which of the following statements is(are) true?

(a) the total mechanical energy of a system, at any one instant, is either all kinetic or all potential energy.
(b) the total mechanical energy of a system is constant only if nondissipative interactions occur.
(c) the total mechanical energy of a system is constant only if dissipative interactions occur.
(d) the total mechanical energy of a system is equally divided between kinetic and potential energy.
(e) mechanical energy can be dissipated to nonmechanical forms of energy.

B) True

E)True    

Explanation:

As we know that the total mechanical energy is summation of potential energy and kinetic energy.

A)False

This statement is false because it say that all kinetic or all potential energy.This should not be all.

B) True

When dissipative interactions occurs then the total mechanical energy of the system can not be constant.But if  nondissipative interactions occur then the total mechanical energy of the system is remain constant.

C)False

When dissipative interactions occurs then the total mechanical energy of the system can not be constant.But if  nondissipative interactions occur then the total mechanical energy of the system is remain constant.

D)False

This is not true because we know that total mechanical energy is summation of potential energy and kinetic energy.But does not tell that it will be equally divided between kinetic and potential energy.

E)True

Yes it is true because the mechanical energy can be converted in to heat energy due to friction force.

speed

ratio of distance traveled to time interval

net force

vector sum of forces on object

object

source of diverging light rays either luminous or illuminated

don't remove my answer im trying my best to answer them

explanation:

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.