A 615 N student standing on a scale in an elevator notices that the scale reads 645 N. From this information, the student knows that the elevator must be moving
A) downward.
B) upward.
C) You cannot tell if it is moving upward or downward.
C
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Components: The magnitude of a vector an only zero if all of its components are zero.
A. True B. False
6The sideral period of the moon
a. is about 27.32 days long. b. is the period of time for the moon to orbit Earth once with respect to the stars. c. is the period of time between successive eclipses at a given location on Earth. d. is the period of time from when the moon rises until the moon rises again the next night. e. a and b above
We expect a scientific theory to be able to make predictions that can be tested. Which of the following is a prediction of the nebular theory that has been verified by observations?
a. Large planets should have at least some moons that are larger than the smallest planets. b. Planetary orbits should lie in approximately the same plane as the disk of the Milky Way Galaxy. c. Earth-size planets should have fairly large moons. d. Many stars should have planets.
A box of mass 72 kg is at rest on a horizontal frictionless surface. A constant horizontal force of magnitude F then acts on the box, accelerating it to the right. You observe that it takes the box 3.4 seconds to travel 13 meters
What is the magnitude of the force F?