What are we made of?
A.) Dark energy.
B.) Dark matter.
C.) Atoms.
Ans: C.) Atoms.
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What advantages does a large-diameter astronomical telescope have over a telescope of a smaller diameter?
What will be an ideal response?
A box is pushed across a horizontal table at constant speed. Of the forces on it, which pair do we know are equal in magnitude because of Newton’s third law?
A. Normal force on the box and the weight of the box. B. Normal force on the box and the normal force on the table by the box. C. The force of kinetic friction on the box and the force applied to the box by the one pushing it. D. None of these are interaction pairs.
Which of the following could be a hypothesis for the function of the thick waxy coating of a pine needle
A. If the thick, waxy coating is destroyed, the pine needle will turn B. The thick, waxy coating prevents water loss C. What happens to the needle if the thick, waxy coating is brown. destroyed? D. The tree would feel cold without the thick, waxy coating
In this figure, light travels across a spaceship as the spaceship accelerates upward. As the light travels, its speed:
a. increases. b. remains constant. c. decreases. d. first increases and then decreases. e. first decreases and then increases.