The image in a pinhole camera is
A) always inverted.
B) sometimes inverted.
C) always right-side up.
Answer: A
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The Algol paradox is explained by considering
a. the degenerate nature of the hydrogen on the surface of the white dwarf. b. synchrotron radiation. c. the rate of expansion of the shock wave inside the supernova. d. the rotation rate of a neutron star. e. mass transfer between the two stars in a binary system.
What holds galaxy clusters together?
A. the strong force B. the cosmological constant force C. the electromagnetic force D. gravity E. the pressure from the cosmic background radiation
The buoyant force of an object is equal to the ______________ of the ______________ it displaces
a. mass; fluid b. weight; fluid c. mass; solid d. weight; solid
At high noon, the Sun delivers 900 W to each square meter of a blacktop road. What is the equilibrium temperature of the asphalt, assuming its emissivity e = 1? (s = 5.67 × 10^-8 W/m2×K4)
a. 75°C c. 91°C b. 82°C d. 99°C