Suppose we use a string to suspend a ball from a hook in the ceiling. As the ball swings back and forth, which interaction does work on the system if we consider the system to be the ball or
A. The ball’s gravitational interaction with the earth
B. The ball’s contact interaction with the string
C. Both interactions
D. Neither interaction
A. The ball’s gravitational interaction with the earth
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Which of these substances must be primordial?
A) helium B) lithium C) deuterium D) beryllium E) tritium
The water level in identical bowls, A and B, is exactly the same. A contains only water; B contains floating ice as well as water. When we weigh the bowls, we find that
A.
B.
C.
D.
the volume of the water.E.
A uniform meterstick balances on a fulcrum placed at the 70.0-cm mark when a weight w is placed at the 90.0-cm mark. What is the weight of the meterstick?
a. w b. 1.0w c. w/1.0 d. 0.70w e. 0.90w
Which of the following elements commonly forms an ion with a 2+ charge?
a. Li b. Al c. S d. Ca