Which of the following is NOT true of work?
(A) It is the scalar product of force and displacement.
(B) It is measured in joules.
(C) It has the same units as energy.
(D) It is a vector which is always in the same direction as the displacement.
(E) It takes energy to perform work
Ans: (D) It is a vector which is always in the same direction as the displacement.
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Fill in the blank(s) with correct word
Why is the air over an open flame always moist?
A) The hot flame vaporizes the water in the air above the flame. B) One of the products of combustion is water vapor. C) Warm air contains more humidity than cold air. D) None of the above is true.
In a photo like the Hubble Deep Field (Figure 16.1 in your textbook), we see galaxies in many different stages of their lives. In general, which galaxies are seen in the earliest (youngest) stages of their lives?
A) the galaxies that have the most hot, young O and B stars B) the galaxies that are the reddest in color C) the galaxies that are farthest away D) the galaxies that are nearest to us
How many degrees separate the central meridians that each time zone is based on?
What will be an ideal response?