A typical incandescent light bulb consumes 75 W of power and has a mass of 30 g
You want to save electrical energy by dropping the bulb from a height great enough so that the kinetic energy of the bulb when it reaches the floor will be the same as the energy it took to keep the bulb on for 1.0 hour. From what height should you drop the bulb, assuming no air resistance and constant g?
920 km
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In gravitational red shift, the quantity that undergoes a red shift is
A) spacetime curvature. B) wave direction. C) field intensity. D) wave frequency. E) none of the above
Which has the more predictable behavior, an electron or a proton, and why?
A) An electron, because of its smaller mass. B) A proton, because of its larger mass. C) A proton, because it does feel the nuclear force. D) An electron, because of its smaller charge. E) An electron, because it doesn't feel the nuclear force.
List the advantages the Hubble Space Telescope has over ground-based telescopes
What will be an ideal response?
After the dropped box hits the floor, its kinetic energy is converted into ____________
Fill in the blank(s) with correct word