A 40 kg-skier starts at the top of a 12-meter high slope. At the bottom, she is traveling 10 m/s. How much energy does she lose to friction? A. She doesn't lose any because mechanical energy is always conserved.

B. 4,704 J

C. 2,000 J

D. 2,704 J

What pose a particular danger to motorcyclists and can compel them to change their position?

During an investigation, a scientist heated 123.6 g of copper carbonate till it decomposed to form a black residue. The total mass of the black residue formed was 79.6 g.

Car A rear ends Car B, which has twice the mass of A, on an icyroad at a speed low enough so that the collision is essentiallyelastic. Car B is stopped at a light when it is struck. Car A hasmass m and speed v before the collision.

Two waves equal amplitudes meet other result in a wave with zero amplitudes. Which phenomenon

Which elements do hydrogen fuel cells combine to produce electricty

What type of energy comes from the food that we eat?

Which of the following are vector quantities? check all that apply. a. time b. displacement c. force d. mass

Imagine you are on a bus with a helium balloon tied on a string tied to the seat in front of you. the bus stops short to avoid running over a rabbit and you are thrown forward. what happens to the balloon in relation to the bus? 1. the balloon pops.

Give one reason why the density of iron is higher than the density of oxygen

In which region of the periodic table do the elements NOT normally react chemically with other elements? A. metals B. metalloids C. nonmetals D. noble gases