A bus is designed to draw its power from a rotating flywheel that is brought up to its maximum speed (3000 rpm) by an electric motor. The flywheel is a solid cylinder of mass 250 kg and radius 0.500 m (Icylinder = MR2/2). If the bus requires an average power of 10.0 kW, how long will the flywheel rotate?
a. 154 s b. 308 s
c. 463 s d. 617 s
a
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Identify a true statement about the Sun
A) It is the smallest star in the Universe. B) It is at a distance of 2 AU from Earth. C) It shines by reflecting light from the Moon. D) It generates its own energy.
A telescope with a large-diameter aperture or mirror will ________.
A. collect a lot of light and have high resolution B. collect less light, and have poor resolution C. collect a lot of light, but have poor resolution D. collect less light, but have higher resolution
A refrigerator weighing 1500 N is to be lifted onto a truck bed that is 1.0 m above the ground. When pushed up a slanting ramp 2.0 m in length a force of only 750 N is required to move it at constant velocity. Neglecting friction and comparing the work involved in lifting the refrigerator straight up to the work in pushing it along the ramp, there is
A. an equal amount of work is required in each case. B. less work required when the ramp is employed. C. more work required when the ramp is employed.
The body chiefly responsible for ocean tides is the
1) Moon, 2) Sun, chiefly because 3) the Moon is closer to Earth than the sun. 4) gravitational pull by the Moon is less than that of the sun. 5) the difference between the Moon's pull on the near and far sides of Earth is appreciable.