Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.The increase of potential energy of the box is
a. 0 b. 4 J.
c. 100 J. d. none of the above.
c
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What is Ceres?
A) the largest known asteroid B) the first asteroid to have been visited by a spacecraft C) the largest moon of Pluto D) a dwarf planet that orbits the Sun in the Kuiper belt beyond the orbit of Pluto
The age of a star cluster may be estimated by determining the ________ of the Main Sequence at which stars are just in the process of evolving away to become giant stars
Fill in the blank(s) with correct word
Which has greater kinetic energy: a car traveling at 30 km/h or another car of half the mass traveling at 60 km/h?
A) The 30-km/h car B) The 60-km/h car C) both have the same kinetic energy
What wavelength monochromatic source in the visible region (390 to 710 nm) can be used to constructively reflect off a soap film (n = 1.46) if the film is 214 nm thick?
a. 417 nm b. 446 nm c. 406 nm d. 489 nm e. 479 nm