A design requires a material that must operate up to a temperature of 300°C (572°F), have a high resistance to deformation, a high strength, a high resistance to fracture, and a low cost. Which of the following materials is most likely to best satisfy the design requirements?
(a) Alumina ceramic
(b) Low-carbon steel
(c) Polyethylene
(d) Graphite-reinforced epoxy
(b) Low-carbon steel
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When the Sun is on the horizon, it is actually lower than it appears because of
a. refraction. b. dispersion. c. scattering. d. reflection.
The magnetic field produced by a long straight current-carrying wire is
A) proportional to both the current in the wire and the distance from the wire B) proportional to the current in the wire and inversely proportional to the distance from the wire. C) inversely proportional to the current in the wire and proportional to the distance from the wire. D) inversely proportional to both the current in the wire and the distance from the wire. E) independent of both the current in the wire and the distance from the wire.
Two cars, each of mass 2 200 kg and traveling at 14.0 m/s, undergo a head-on completely inelastic collision. What is the change in entropy of the Universe which results from this collision? Assume the ambient temperature is 20.0°C
a. 1.47E+3 J/K b. 2.2E+4 J/K c. 7.35E+2 J/K d. 6.2E+5 J/K
Most terrestrial planets have portions of their surface that appear to be significantly older than other portions of their surface. What evidence suggests that the surface of Venus is all of the same age?
a. Photos taken by probes that landed on Venus showed that all of the rocks were of the same age. b. The craters on Venus are randomly distributed in size and number across the surface. c. The volcanoes on Venus are not found in isolated groups, but are scattered around the planet. d. Photos taken by probes that landed on Venus showed that all of the rocks were of the same age and the craters on Venus are randomly distributed in size and number across the surface. e. Photos taken by probes that landed on Venus showed that all of the rocks were of the same age, all of the rocks were of the same age and the craters on Venus are randomly distributed in size and number across the surface, and the volcanoes on Venus are not found in isolated groups, but are scattered around the planet.