Newton's Second Law of Motion tells us that the net force applied to an object equals its ________
A) mass times velocity B) mass times acceleration
C) mass times energy D) momentum times velocity
B
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An object is placed 15 cm in front of a diverging lens whose focal length is 12 cm. Where will the image be located (in cm)?
A. ?6.7 B. ?7.2 C. ?0.15 D. ?60 E. ?5.0
To make an n-type semiconductor from silicon, one adds impurity atoms of
A. cobalt. B. oxygen. C. arsenic. D. fluorine. E. gallium.
____ galaxies have a great many short spiral segments branching from the spiral arms
a. Grand design b. Super spiral c. Cepheid d. RR Lyra e. Flocculent
Gravitational Force: Two small objects, with masses m and M, are originally a distance r apart, and the magnitude of the gravitational force on each one is F. The masses are changed to 2m and 2M, and the distance is changed to 4r. What is the magnitude of the new gravitational force?
A. F/16 B. F/4 C. 16F D. 4F E. F/2