A spaceship traveling at constant speed away from the Sun crosses the orbit of Earth and later crosses the orbit of Mars
What is the distance between these two events in the spaceship frame of reference? The radius of Earth's orbit is 150 × 109 m and that of Mars is 228 × 109 m.
Zero m
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Small rocky bodies with compositions similar to Earth that are in orbit around the Sun are called ________
Fill in the blank(s) with correct word
The force that acts between a pair of magnetic poles depends on
A) magnetic pole strength. B) separation distance. C) both of these D) neither of these
When we say that the electromagnetic and weak forces "freeze out" from the electroweak force at 10-10 seconds after the Big Bang, we mean that
A) these forces are important only at temperatures below the freezing point of water—a temperature that the universe reached at an age of about 10-10 second. B) "freezing out" was a term coined by particle physicists who think that the Big Bang theory is really cool. C) prior to this time the electromagnetic and weak forces maintained a single identity, but they possessed separate identities following this time. D) following this time neither the electromagnetic nor the weak force was ever important in the universe again. E) quantum fluctuations by high-speed, relativistic particles in a state of false vacuum cause disturbances in the spacetime continuum, leading to the process described in the question this answer refers to.
When the equation Ga + Br2 ? GaBr3 is balanced, the total of all the coefficients (both written and "understood") is
a. 4. b. 3. c. 6. d. 7.