A wooden crate having mass 100 kg is pushed across a tile floor. The coefficient of friction between the crate and the floor is 0.25. What is the force of friction on the moving crate? *

Awheel of mass 48 kg is lifted to a height of 0.8 m. how much gravitational potential energy is added to the wheel? acceleration due to gravity is g = 9.8 m/s2. a. 30.4 j b. 3.1 j c. 297.9 j d. 11,321 j

Since the energy was not raising the temperature of the water during these segments, what was the energy used to do instead? your answer must include an explanation of what is happening to the molecules.

Could we see a galaxy that is 20 billion light-years away?