Significant Figures: A train travels at a constant speed of 60.4 mi/h for 101.5 min. What distance does the train cover expressed to the correct number of significant figures?
A. 100 mi
B. 102 mi
C. 102.2 mi
D. 102.18 mi
E. 102.181 mi
Answer: B
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This image combines a visible-light view of the galaxy Hercules A with an image showing radio wave emission (the reddish colors) in its vicinity. The likely explanation for the two huge clumps of radio emission far to either side of the visible galaxy is
A) the radio emission comes from gas shot out into space by jets powered by a supermassive black hole in the galactic center. B) the radio emission comes from gas that was left behind in the halo when the galaxy collapsed from a protogalactic cloud. C) the radio emission comes from gas pulled out of the galaxy when it collided with another galaxy in the distant past. D) this galaxy must have suffered two collisions in the past, with each collision pulling out gas in one direction.
A carousel that is 5.00 m in radius has a pair of 600-Hz sirens mounted on posts at opposite ends of a diameter. The carousel rotates with an angular velocity of 0.800 rad/s. A stationary listener is located at a distance from the carousel
The speed of sound is 350 m/s. The maximum beat frequency of the sirens at the position of the listener is closest to A) 6 Hz. B) 8 Hz. C) 10 Hz. D) 12 Hz. E) 14 Hz.
How many MeV of energy is released during a reaction in which 1.67 × 10-25 kg of material is converted to energy? (c = 3.0 × 108 m/s, 1 eV = 1.67 × 10-19 J)
A) 5.0 × 10-14 MeV B) 4.1 × 10-7 MeV C) 3.1 × 10-4 MeV D) 9.4 × 104 MeV
According to the Big Bang theory, why do we live in a universe that is made of matter rather than antimatter?
A) Einstein's famous equation E = mc2 tells us that energy can turn into matter, but does not tell us that it can turn into antimatter. B) GUT theories predict that under the conditions that prevailed in the early universe, the normal laws of physics would have been suspended so that only matter particles were created, and no particles of antimatter. C) The fact that we live in a universe made of matter is not surprising because antimatter has never been shown to exist for real. D) During the first 0.001 second after the Big Bang, particles and antiparticles were made in almost but not perfectly equal numbers. Everything annihilated except the very slight excess of matter particles.