The number of times a machine multiplies the effort force is?

a) resistance force
b) effort distance
c) mechanical advantage
d) efficiency

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories

Lacie kicks a football from ground level at a velocity of 13.9 m/s and at an angle of 25.0° to the ground. how long will the ball be in the air before it lands? how far will the football travel before it lands?

Matter that emits no light at any wavelength is called