A wrench is placed at 30 cm in front of a concave lens with a focal length of magnitude 10 cm. What is the magnification of the wrench?
A) 0.25
B) -0.25
C) 0.67
D) -0.67
E) 4.0
A
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When a 10-kg block is simultaneously pushed toward the east with 20 N and toward the west with 15 N, the combination of these forces on the block is
A) 5 N west. B) 5 N east. C) 35 N east. D) 35 N west.
Charge A and charge B are 3.00 m apart, and charge A is +1.44 C and charge B is +3.10 C. Charge C is located between them at a certain point and the force on charge C is zero. How far from charge A is charge C?
a. 1.78 m b. 2.15 m c. 1.22 m d. 0.465 m e. 2.04 m
How should we expect the Milky Way's interstellar medium to be different in 50 billion years than it is today?
A) The total amount of gas will be much less than it is today. B) The total amount of gas will be about the same, but the percentage of elements heavier than hydrogen and helium will have risen from the current 2% to more than 50%. C) The total amount of gas will be much greater because many stars will undergo supernovae between now and then. D) Thanks to the recycling of the star-gas-star cycle, the interstellar medium should look about the same in 50 billion years as it does today.