Asteroids which could possibly collide with the Earth at some time in the future are known as
A) killer asteroids
B) Earth-crossing asteroids
C) Armageddon asteroids
D) potentially hazardous asteroids
D
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Compared with the spectral lines in the solar spectrum, lines in a supergiant spectrum are
a. sharper. b. broader. c. weaker. d. stronger. e. broader and weaker.
RLC Circuits: A resistance of 55 ?, a capacitor of capacitive reactance 30 ?, and an inductor of inductive reactance 30 ? are connected in series to a 110-V rms, 60-Hz power source. What rms current flows in this circuit?
A. 2.0 A B. less than 2.0 A C. more than 2.0 A D. none of the given answers
Suppose we look at a photograph of many galaxies. Assuming that all galaxies formed at about the same time, which galaxy in the picture is the youngest?
A) the one that is farthest away B) the one that is reddest in color C) the one that is bluest in color D) the one that is closest to us E) the one that appears smallest in size
State Pascal's Principle
What will be an ideal response?