If the current through a 500 W heater is 4.00 A, what is the potential difference across the ends of the heating element? *
O 2x10^3 V
8x10^-3 V
25 V
125 V

Aplanet of mass m 6.75 x 1024 kg is orbiting in a circular path a star of mass m 2.75 x 1029 kg. the radius of the orbit is r 8.05 x107 km. what is the orbital period (in earth days) of the planet tplanet?

Work = force × a. work b. energy c. distance d. momentum

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