Which correctly identifies the distribution of elements in the universe?
a. the universe is 70% hydrogen and 2% heavy elements.
b. the universe is 80% hydrogen and 9% oxygen.
c. the universe is 90% heavy elements and 4% hydrogen.
d. the universe is 95% heavy elements and 2% oxygen.?

An object starts from rest at point f and speeds up continuously as it moves around an oval. a. choose a point about 1/8 th of the way around the oval from point f, and label it point g. draw a vector to represent the velocity of the object at point g. b. determine the change in velocity vector   between points f and g.

The least penetrating form of radiation is

An athlete is holding 24 lb of weights at a height of 6 inches above the stack as shown. to lower the weights, she applies a constant force of 5 lb to the handle. determine the velocity of the weights immediately before they hit the stack.