Jill is pushing a box across the floor. Which represents the upward force perpendicular to the floor? A.) Fp
B.) Ff
C.) FN
D.) Fg

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?

What are similarities and differences of reflection, refraction, diffraction and absorption?

You have a pick-up truck that weighed 4,000 pounds when it was new. you are modifying it to increase its ground clearance. when you are finished