Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. The work you do on the crate is __________
Fill in the blank(s) with correct word
Fd
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Why can't we see the center of our galaxy with our eyes?
A) We are in the center of the Milky Way. B) There are no stars in the center of the Milky Way, just a supermassive black hole. C) Interstellar dust and gas absorbs and scatters visible light before it can reach us from the center. D) The center of the Milky Way does not emit enough visible light. E) Stars are too densely spaced in the plane of our galaxy to see all the way to the center.
Angela claims that she wears a cylindrical-shaped hollow gold bracelet because it expands less than a solid one with a change in temperature. Clarissa claims that a cylindrical-shaped solid gold bracelet expands less than a hollow one. Which one, if either, is correct?
A. Angela, because the bracelet expands outward on its outer surface and inward on its inner surface. B. Clarissa, because the bracelet expands outward on its outer surface and inward on its inner surface. C. Angela, because the inner circumference does not change, but the outer circumference expands. D. Clarissa, because the inner circumference does not change, but the outer circumference expands. E. Neither, because both the inner and outer circumferences increase in length.
The period of a satellite circling planet Nutron is observed to be 84 s when it is in a circular orbit with a radius of 8.0 × 10^6 m. What is the mass of planet Nutron?
a. 6.2 × 10^28 kg b. 5.0 × 10^28 kg c. 5.5 × 10^28 kg d. 4.3 × 10^28 kg e. 3.7 × 10^28 kg
While a material is changing state:
a. its temperature is constantly changing. b. its temperature stays constant. c. its atomic and molecular motions become less limited. d. its internal (thermal) energy stays constant. e. the amount of heat needed is given by its specific heat.