The "Big Bang" refers to the
A) point in time in which the known (and perhaps knowable) universe came into being.
B) phenomenon of rapid chain reaction supernovae during the first 100 seconds of the universe.
C) time when our Sun will become a nova, rendering Earth into molten lava.
D) end of the universe when simultaneous supernovae will transform the universe into a supergiant black hole.
Answer: A
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The position of an object as a function of time is given by where and (a) Find the instantaneous acceleration at t =2.4 s. (b) Find the average acceleration over the first 2.4 seconds
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Uranus completes an orbit around the Sun every 84 years and spins once every 17 hours, approximately. Which of the following could be observed from the planet Uranus?
A. one sunrise every 17 hours on the equator B. nights lasting several years near the pole tipped away from the Sun C. days lasting several years near the pole tipped toward the Sun D. season cycle of 84 years near the poles E. All of these choices are correct.
Light behaves primarily as a particle when it
A) travels from one place to another. B) interacts with matter. C) both of these D) neither of these
The position x(t) of a particle as a function of time t is given by the equation x(t) = (3.5 m/s)t - (5.0 m/s2)t2. What is the average velocity of the particle between t = 0.30 s and t = 0.40 s?
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