The expansion of the universe seems to be accelerating. The evidence for this is based on observations of
A) the manner in which the stars are distributed in our own galaxy.
B) the cosmic background radiation.
C) the slowing down in the pulsation rate of distant neutron stars.
D) gas clouds orbiting the centers of galaxies.
E) the redshift in the light from the explosions of distant supernovas.
E
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Alien astronomers are using the radial-velocity method to look for planets around our Sun. Which planet are they most likely to detect first?
A. Jupiter B. Neptune C. Mercury D. Earth
If one caisson of the Falkirk Wheel carries a boat loaded with Styrofoam and the other carries a floating boat loaded with iron, the wheel would be
A) balanced. B) out of balance. C) unbalanced but still useful. D) useless for lifting boats.
The temperature coefficient of resistivity of iron is 5.0 × 10^?3 / °C; that of carbon is ?0.50 × 10^?3 / °C. When an iron wire and a carbon rod, each having the same 10 ? resistance at 20°C, are cooled from that temperature to ?80°C, the new ratio of the resistance of the carbon rod to the resistance of the iron wire at the lower temperature is
a. ?0.10. b. +1.9. c. +2.1. d. ?10. e. +10.
Samus is exploring the planet Zebes in the star system Metroid Prime (where the laws of physics are the same as on Earth and in our universe) in a ship moving at constant velocity. She turns on her headlamps as she encounters some strange fog. Ridley, the villain lying in wait, is at rest with respect to Samus. The speed of the light from Samus's headlamps as measured by Ridley depends most
importantly on