A car moves 4 times as fast as another identical car. Compared with the slower car, the faster car has
A) 4 times the kinetic energy.
B) 8 times the kinetic energy.
C) 12 times the kinetic energy.
D) 16 times the kinetic energy.
Answer: D
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What does the universe look like on very large scales?
A) Galaxies are uniformly distributed. B) Galaxies are randomly distributed. C) Galaxies are distributed in a hierarchy of clusters, superclusters, and hyperclusters. D) Galaxies appear to be distributed in chains and sheets that surround great voids. E) Galaxies are distributed in a great shell expanding outward from the center of the universe.
A construction worker pulls a box of tools on a smooth horizontal floor with a force of 100 N in a direction of 37.0° above the horizontal. The mass of the box and the tools is 40.0 kg
(a) Draw a free-body diagram for the box. (b) Calculate the acceleration of the box. (c) How hard does the floor push up on the box?
The period-luminosity relation is critical in finding distances with:
A) RR Lyrae stars. B) trigonometric parallaxes. C) spectroscopic parallaxes. D) Cepheid variables. E) pulsars.
In an exothermic reaction, bonds may be broken
What will be an ideal response?