Which of the following situations is impossible?
A) An object has velocity directed east and acceleration directed east.
B) An object has velocity directed east and acceleration directed west.
C) An object has constant non-zero acceleration and changing velocity.
D) An object has zero velocity but non-zero acceleration.
E) An object has constant non-zero velocity and changing acceleration.
E
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Addition by Components: You walk 53 m to the north, then you turn 60° to your right and walk another 45 m. Use components to determine the direction of your displacement vector. Express your answer as an angle relative to east.
A. 63° N of E B. 50° N of E C. 57° N of E D. 69° N of E
What would happen to Earth if we somehow moved our planet to the orbit of Venus?
A) Temperatures would rise only slightly, but enough to melt the polar caps. B) The fact that we have oceans would moderate the temperature change due to moving our planet, so temperature would hardly change at all. C) Being so much closer to the Sun would almost immediately cause the surface of Earth to melt, and all our cities would then be destroyed by the hot lava. D) Earth would suffer a runaway greenhouse effect and become as hot or hotter than Venus.
Considering Einstein's famous equation, E = mc2, which of the following statements is true?
A) Mass can be turned into energy, but energy cannot be turned back into mass. B) It takes a large amount of mass to produce a small amount of energy. C) A small amount of mass can be turned into a large amount of energy. D) You can make mass into energy if you can accelerate the mass to the speed of light. E) One kilogram of mass represents 1 joule of energy.
Which of these things did Galileo NOT do?
a. Make up a thought experiment that indicated that objects would fall at the same rate. b. Invent the concept of acceleration. c. Stop publishing his scientific work after being convicted of heresy. d. Experiment with rolling balls down ramps of increasing steepness to test how objects would fall. e. Argue that Earth moves around the Sun.