A ‘cliff diver' in Mexico dives off a high cliff and falls for 2.3 seconds before hitting the water. (a) How fast is the diver going at impact? (b) How far below the cliff is the diver at this point?
22.5 m/s, 25.9 m
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Which of the following is not a major idea of Einstein's general theory of relativity?
A) Time runs slower near strong gravitational fields. B) It is possible to travel through wormholes. C) Our universe can have no center or boundaries, yet be finite. D) Black holes can exist in spacetime, and falling into a black hole means leaving the observable universe.
The star Vega has an absolute magnitude of about 4 and an apparent magnitude of about 0. Based on the definitions of absolute and apparent magnitude, we can conclude that ________
A) Vega's surface temperature is cooler than the Sun B) Vega is nearer than 10 parsecs from Earth C) Vega's luminosity is less than that of our Sun D) Vega has a parallax angle of 1/10 arcsecond
Today, we know that Newton's "laws" are
A) often incorrect when applied to molecular-sized objects. B) incapable of explaining the motions of the planets. C) in agreement with all known experimental evidence. D) no longer useful as scientific principles. E) often incorrect when applied to liquids.
On a PV diagram, 2 curves are plotted, both starting at the same point (P1, V1) and both ending at the same increased volume (V2). One curve is for an isothermal process; the other is for an adiabatic process. Except for the common starting point, which curve is the upper one?
a. The isothermal process curve will always be the upper one. b. The adiabatic process curve will always be the upper one. c. Since they start at the same point and end at the same volume, they will coincide. d. The isothermal one will start out higher, but the adiabatic one will eventually cross it.