A solid sphere of mass 2.50 kg and radius 0.120 m is at rest at the top of a ramp inclined 15.0°. It rolls to the bottom without slipping. The upper end of the ramp is 1.20 m higher than the lower end. Find the sphere's total kinetic energy when it reaches the bottom
a. 70.0 J b. 47.9 J
c. 29.4 J d. 8.80 J
c
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A car travels at 15 m/s for 10 s. It then speeds up with a constant acceleration of 2.0 m/s2 for 15 s. At the end of this time, what is its velocity?
A) 15 m/s B) 30 m/s C) 45 m/s D) 375 m/s
An astronaut stands by the rim of a crater on the Moon, where the acceleration of gravity is 1.62 m/s2 and there is no air. To determine the depth of the crater, she drops a rock and measures the time it takes for it to hit the bottom
If the time is 6.3 s, what is the depth of the crater? A) 10 m B) 14 m C) 26 m D) 32 m E) 38 m
When you look at a white light through a blue piece of glass, you observe blue light. This means that the blue glass
A. absorbs all of the blue light. B. reflects all of the blue light. C. transmits all colors except blue. D. transmits only the blue light. E. transmits only cyan and magenta.
The spacing between the parallel power lines is affected by
A) current-carrying capacities of wires. B) electrical insulation. C) the wing span of birds in the vicinity. D) none of the above