If the same-sized force is made to act over a smaller area, the pressure is
a. decreased
b. increased
c. unchanged
d. dependent upon the shape of the area
B
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Which telescope has the largest light-gathering power among the following telescopes?
A) A telescope of diameter 5 cm and focal length 50 cm B) A telescope of diameter 6 cm and focal length 100 cm C) A telescope of diameter 2 cm and focal length 100 cm D) A telescope of diameter 3 cm and focal length 75 cm
The Caloris Basin found on Mercury was probably formed by what process?
A. an impact from a planetesimal B. volcanic activity C. erosion from solar wind D. plate tectonics
On the H-R diagram, white dwarfs Sirius B and Procyon B lie
A) at the top right. B) at the top left. C) at the lower left. D) at the lower right. E) close to the Sun, near the center.
Electric potential is the ratio of electric energy to the amount of electric
A) current. B) resistance. C) charge. D) voltage. E) none of the above