A crate travels through a factory on a horizontal conveyor belt at a constant speed. If air resistance is negligible, what forces are active on the box?
A. Normal force, weight, static friction.
B. Normal force, weight, force of the conveyor belt
C. Normal force, weight, force of the conveyor belt, static friction
D. Normal force and weight.
D. Normal force and weight.
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What evidence leads astronomers to conclude that the universe contains a mysterious dark energy?
A) The expansion of the universe is accelerating with time. B) The gravity of distant galaxies is stronger than that of galaxies nearby. C) Studies of galactic motion indicate that there is more matter in the universe than we can account for with stars and gas. D) Stars shine much more brightly than we would expect from nuclear fusion. E) The existence of such dark energy is the only way to account for evil in the universe.
A person who weighs 550 N empties her lungs as much as possible and is then completely immersed in water (of density 1000 kg/m3) while suspended from a harness. Her apparent weight is now 21.2 N. What is her density?
A) 1050 kg/m3 B) 1040 kg/m3 C) 1030 kg/m3 D) 960 kg/m3 E) 56.1 kg/m3
Four point charges of magnitude 6.00 ?C and are at the corners of a square 2.00 m on each side. Two of the charges are positive, and two are negative
What is the electric potential at the center of this square, relative to infinity, due to these charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2 ) A) 153 kV B) 61.0 kV C) 76.4 kV D) 306 kV E) 0 V
How can the stars in a close binary system dramatically affect each other?
A) The close orbits can allow tidal forces to rip one or both stars apart. B) Transfer of mass from one star to another can change how both stars evolve. C) Intense radiation from one star can heat the surface of the other star, causing it to undergo a supernova explosion.