How many Earth years does it take Pluto to orbit the Sun?
A. 248
B. 0.2
C. 0.5
D. 2012
E. 10
Answer: A. 248
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Name the rapidly rotating disk at the center of the galaxy spinning around the black hole.
A. Acceleration disk. B. Galactic circular storm. C. Compaction zone. D. Convection cell. E. Accretion disk.
When does kinetic friction occur in trying to push a heavy object?
a. When the object is still. b. When the force you apply is smaller than the maximum static frictional force. c. Just before enough force is applied to move the object. d. When the force you apply is larger than the maximum static frictional force. e. When the force you apply is insufficient to set the object in motion.
Olber's paradox states that the ____
a. Universe must have a center, but not an edge b. sky should be as bright as the surface of a star in all directions c. Universe should have an edge, but not a center d. Earth should be at the farthest point in the Universe from the big bang. e. Universe is not infinite, but cannot have an edge or center
The rear window in a car is approximately a rectangle, 2.1 m wide and 0.45 m high. The inside rearview mirror is 0.55 m from the driver's eyes, and 1.70 m from the rear window.
a) What is the minimum length for the rearview mirror if the driver is to be able to see the entire width and height of the rear window in the mirror without moving her head? b) What is the minimum height for the rearview mirror if the driver is to be able to see the entire width and height of the rear window in the mirror without moving her head?