In winter the air just above the top bunk bed is warmer than the air just above the bottom bunk bed, because warm air rises. Which of the following describes the method of heating that causes this difference in temperature

The mass, hanging over the pulley, is representative of the centrifugal force acting on the three-hooked mass while it is rotating.

An atom has at least one positive proton and at least one negative electron. Which of the following is true about the protons and electrons in an atom? A. Protons and electrons orbit close together around a central nucleus. B.

A trailer mechanic pushes a 2500 kg car, home to a speed v, performing a job during the 5000 J. In this process, the car moves 25 m.

What would happen if the earth mass increase

Indicate whether the statement is true or false. Any force that causes an object to move in a circular path is called a centripetal force.

The kinetic energy of a moving object is equal to the work required to bring it to its speed from rest, or the work the object can do while being brought to rest.

Imagine standing on a bathroom scale and reading your weight. now lift one foot and read your weight again. does the scale read more, less or the same weight when you are standing on one foot?

The period T of a simple pendulum depends on the length L of the pendulum and the acceleration of gravity g (dimensions L/T^2). (a) Find a simple combination of L and g that has the dimensions of time.

What is an example of the theory that the best adapted organisms for an environment are the ones most likely to survive

What does not affect the apparent brightness of a star?