When a cannon is fired, it recoils as the cannonball is set in motion. The cannon and cannonball ideally acquire equal
A) but opposite amounts of momentum.
B) amounts of kinetic energy.
C) both of these
D) neither of these
Answer: A
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Which of the following statements about an open star cluster is true?
A) All stars in the cluster are approximately the same color. B) All stars in the cluster are approximately the same age. C) All stars in the cluster have approximately the same mass. D) There is an approximately equal number of all types of stars in the cluster.
Increasing the voltage across the two plates of a capacitor will produce what effect on the capacitor?
a. increase charge b. decrease charge c. increase capacitance d. decrease capacitance
What is different about locating images in convex mirrors compared to locating images in concave mirrors?
a. Among many differences, ray diagrams do not work for convex mirrors. b. Convex mirrors require more rays for a minimum ray diagram. c. Everything is the same except that the focal point is located behind the mirror. d. Because convex mirrors have no focal point, rays must be constructed differently. e. Because convex mirrors have no optic axis, rays must be constructed differently.
The combining of two nuclei to form a larger nucleus with the release of energy is
a. nuclear fission b. nuclear fusion c. neutron activation d. nuclear emission e. beta decay