Vibrations cause sounds yet if you move your hand back and forth through the air, you don't hear a sound. Why?

Does Solid surfaces reflect better than liquid surfaces? If why?

The force produced by gravity on a mass is called

Which of these is NOT a reason why the geocentric model of the solar system was once commonly accepted as the correct model? A. The Sun and Moon appear to orbit Earth. B. Earth rotates on its axis once every 24 hours. C.

What is the name of the units that are normally used to measure energy?

Why is the equator not the hottest place on earth?

if light travels in a vacuum at 3.00 x 10^8m/s and its frequency is 7.44 x 10^7 what is its wavelength

the half-life of carbon - 14 is 5730 years. What fraction of carbon-14 would remain after 11,460 years?

An object with a mass of 10.9 kg experiences a force of 18.53 N. What is the acceleration of the object? A. 2.2 m/s2 B. 1.7 m/s2 C. 16.83 m/s2 D. 1.3 m/s2

A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit

Which of the following terms are needed to completely describe speed? Check all that apply. A. Units B. Direction C. Number D. Mass