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.?

Aferris wheel is a vertical, circular amusement ride with radius 9 m. riders sit on seats that swivel to remain horizontal. the ferris wheel rotates at a constant rate, going around once in 9 s. consider a rider whose mass is 56 kg. at the bottom of the ride, what is the perpendicular component of the rate of change of the rider's momentum? at the bottom of the ride, what is the vector force exerted by the seat on the rider?

Examine the nuclear reacti why is this classified as a nuclear reaction rather than a chemical reaction? it is not balanced. a new compound is formed. a change has occurred in a nucleus. a new element has been formed.

What is the name for the remnant of an asymptotic giant that has lost its shells? black dwarf white dwarf yellow giant black hole