Atruck covers 40.0 m in 9.40 s while uniformly slowing down to a final velocity of 1.70 m/s.
a) find truck's original speed
b) find its acceleration

Which subatomic particle has a negative charge

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?