In gravitational potential energy problems, the quantity (mg) is involved. This represents the A. mass of the object
B. speed of the object
C. momentum of the object
D. weight of the object

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?

How many neutrons does plutonium -196 with an atomic number of 78.

If a hiker that weighs 600 newtons climbs a 50 meter hill, how much gravitational potential energy has the hiker gained?