Two spaceships are traveling through space at speeds of 0.600c and 0.900c, respectively, with respect to Earth
If they are headed directly toward each other, what is their approach speed (in terms of the speed of light) as measured by the captain of either ship?
0.974c
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Why do scientists think that our solar system must have formed sometime after nearby supernovae explosions?
A) existence of heavy elements B) solar temperature too low C) our Sun is a G-type star D) They don't—scientists believe our Sun is among the first generation of stars.
What happens to the atomic number (Z) and the mass number (A) when a nucleus emits a gamma ray?
a. Z increases by 1; A is unchanged. b. Z is unchanged; A is unchanged. c. Z decreases by 1; A is unchanged. d. Z decreases by 2; A decreases by 4.
The equivalent capacitance of the circuit shown below is
a.
0.50 C.
b.
1.0 C.
c.
1.5 C.
d.
2.0 C.
e.
2.5 C.
The period of Jupiter's orbit around the Sun is approximately 12 years. What is the approximate distance from the Sun to Jupiter?
a. 144 AU b. 1728 AU c. 42 AU d. 5.2 AU e. 2.3 AU