Consider a bicycle wheel to be a ring of radius 30. cm and mass 1.5 kg. Neglect the mass of the axle and sprocket
If a force of 20. N is applied tangentially to a sprocket of radius 4.0 cm for 4.0 s, what linear speed does the wheel achieve, assuming it rolls without slipping?
7.11 m/s
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Which of the following energy forms is involved in winding a pocket watch?
a. electrical energy b. nonmechanical energy c. gravitational potential energy d. elastic potential energy
The term Cambrian explosion refers to
a. an asteroid impact. b. the breakup of a supercontinent. c. intense, widespread volcanic activity. d. a proliferation of life forms.
We say that energy cannot be created nor destroyed, yet a heat pump usually delivers more energy (heat) into the house than it receives from the power source (electricity, gas, etc). Why is this not a violation of the law of conservation of energy?
What will be an ideal response?
What is tidal heating?
A) a source of internal heat caused by varying tidal forces acting on a moon or other object B) a source of internal heat that occurs on all moons that are large enough to be spherical C) a source of surface heating caused by the sloshing of water or other liquids D) a source of surface heating caused by active volcanoes like those on Io