Collisions in which total energy is conserved are said to be elastic collisions
Indicate whether the statement is true or false
FALSE
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Why do we sometimes observe asteroids at the distances of the gaps in the asteroid belt?
A) Jupiter's gravitational tugs keep them there.
B) They are held in place by resonances with other asteroids.
C) Actually, we never see asteroids in the gaps.
D) They are kept in place by shepherding asteroids.
E) A gap is located at an average orbital distance, and asteroid orbits often have large eccentricities.
The unified model describes active galactic nuclei using
a. a supermassive black hole at the center of a normal spiral galaxy. b. a supermassive black hole surrounded by an accretion disk and dense disk of gas. c. an accretion disk around a neutron star. d. gravitational lenses to intensify the radiation coming from them. e. different lines of sight toward and dwarf irregular galaxy.
In a certain electroplating process gold is deposited by using a current of 14.0 A for 19 minutes. A gold ion, Au+, has a mass of approximately 3.3 × 10-22 g. How many grams of gold are deposited by this process?
A) 28 g B) 22 g C) 16 g D) 33 g E) 97 g
If the mother in this photo weighs four times as much as the child, where should she sit to keep the seesaw level if the child is seated at the far right hand side?
a. At the midpoint between the left end of the seesaw and the pivot point. b. Halfway between the midpoint and the pivot point. c. At the far left hand side of the seesaw. d. One fourth of the distance from the pivot to the left end of the seesaw. e. Halfway between the midpoint and the end of the left side of the seesaw.