A solid uniform sphere is rolling without slipping along a horizontal surface with a speed of 5.5 m/s when it starts up a ramp that makes an angle of 25° with the horizontal
What is the speed of the sphere after it has rolled 3.0 m up as measured along the surface of the ramp?
A) 4.0 m/s
B) 8.0 m/s
C) 1.9 m/s
D) 2.2 m/s
E) 3.5 m/s
E
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A) total number of protons and neutrons B) number of electrons C) number of neutrons D) number of protons
Early telescopic observers thought the lunar mare were seas of water; today we know they are not liquid water but molten basalt, long ago frozen out
Indicate whether the statement is true or false
A bicyclist starts down a hill with an initial speed of 2.0 m/s. She moves down the hill with a constant acceleration, arriving at the bottom of the hill with a speed of 8.0 m/s. If the hill is 12 m long, how long did it take the bicyclist to travel down the hill?
Two cylindrical resistors are made of the same material and have the same resistance. The resistors, R1 and R2, have different radii, r1 and r2, and different lengths, L1 and L2 . Which of the following relative values for radii and lengths would result in equal resistances?
a. r1 = r2 and 4L1 = L2 c. 2r1 = r2 and 4L1 = L2 b. r1 = r2 and L1 = 2L2 d. 2r1 = r2 and L1 = 2L2