A10 kg box initially at rest is pulled with a 50 n horizontal force for 4 m across a level surface. the force of friction acting on the box is a constant 20 n. how much work is done by the gravitational force?
a. 10 j
b. 0 j
c. 50 j
d. 100 j

How is the composition of a meteorite relevant to finding out the composition of earth's core?

What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h

28. which is not a reason that water is used to store spent fuel rods from nuclear power plants? water increases the speed of the chain reaction in the fuel rods. water protects nuclear power plant workers from the high temperature and radiation of the fuel rods. water acts as a radiation shield to reduce the radiation levels. water cools the spent rods. salts action