Proportional Reasoning: Two cars are traveling at the same speed and hit the brakes at the same time. Car A decelerates (decreases its velocity) at twice the rate of car B. If car B takes time T to stop, how long does it take car A to stop?

A. 4T
B. 2T
C. T
D. T /2
E. T/4


Answer: D

Physics & Space Science

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Dimensional Analysis: Using dimensional analysis, which one of the following equations is dimensionally correct? In these equations, x has units of meters, t has units of seconds, v has units of meters per second, and a has units of meters per second2.

A. x = v/t B. v = 2ax C. t2 = x/a D. x2 = 2av E. x = at

Physics & Space Science

After a supernova event, what is left behind?

A) always a white dwarf B) always a neutron star C) always a black hole D) either a white dwarf or a neutron star E) either a neutron star or a black hole

Physics & Space Science

The Milky Way and M31 in Andromeda both belong to the ________

Fill in the blank(s) with correct word

Physics & Space Science

If an element has 15 protons and 16 neutrons and 15 electrons, what is the mass number of the element?

A) 31 B) 15 C) 16 D) 30 E) none of the above

Physics & Space Science