In a reflecting telescope the objective is a ____
a. prism
b. mirror
c. lens
d. diffraction grating
e. photographic plate
B
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If a star is extremely massive (well over 100 solar masses), why isn't it likely to survive for long?
A) It explodes as a supernova after just a few dozen years. B) It may blow itself apart because of radiation pressure. C) It eventually divides into two lower-mass stars. D) Its great mass will cause it to suck itself into becoming a black hole.
Kinetic Energy: If, instead of the correct formula for kinetic energy, we carelessly use the classical expression for kinetic energy for a particle moving at half the speed of light, by what magnitude percent will our calculation be in error? (c = 3.0 × 108 m/s)
A. 24% B. 19% C. 27% D. 7% E. 1%
A child riding on a swing, Andrea, rises to a height 1.0 m above the lowest point. Another child of equal mass, Brian, has a speed at his lowest point that is twice as great as Andrea's speed at her lowest point. Brian will rise
A. twice as high. B. four times as high. C. to the same height. D. to a height which depends on the mass.
Massive, more luminous stars have shorter lives than their smaller, dimmer counterparts
Indicate whether the statement is true or false