A mountain climber lies flat on the surface of a glacier that is inclined at 30 degrees below the horizontal. He remains stationary because he is holding onto a rope attached to a spike embedded in the ice further up slope than he is. The rope is parallel to the surface of the ice. If the force of the ice upon his body is 210N, what is the tension in the rope?
A. 121N
B. 105N
C. 182N
D. 364N
E. 242N
A. 121N
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Imagine the much more massive Jupiter were to switch places with the less massive Mercury. Which of the following would accurately describe the outcome?
A. Jupiter would orbit the Sun in less time than it did before. B. Mercury would orbit the Sun in less time than it did before. C. The orbital time for each of the planets would not change. D. Jupiter would orbit the sun in more time than it did before.
A block is placed in oscillation on a frictionless horizontal surface attached to a spring that is also attached to a wall. If, when stretched away from equilibrium by 15 cm and released, it oscillates with a period of 0.25s, and if the mass of the block is 15 kg, what force was required to stretch the spring by the initial 15 cm?
A. 230 N B. 450 N C. 710 N D. 360 N E. 1400 N
When a microwave filter consisting of vertical parallel metal rods is in the absorbing position, oscillating currents are set up in the rods. At any one instant, the current in each rod has the same magnitude and direction. At that instant
a. the rods will try to move apart horizontally. b. the rods will try to move together horizontally. c. the rods will try to shift vertically upwards. d. the rods will try to shift vertically downwards. e. the rods will not be affected because the source of current is not a battery.
SETI (the Search for Extraterrestrial Intelligence) searches for communications from life in planets and moons
A) around nearby stars. B) toward the center of the Milky Way. C) in globular clusters. D) in other galaxies. E) within the solar system.