Baryon number is conserved in all interactions
Indicate whether the statement is true or false
T
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The creation of ________ require(s) that a young hot star (T ? 25,000 K) be relatively nearby
a. emission nebulae b. HI regions c. molecular clouds d. the cool gas of the interstellar medium e. 21-cm radiation
Briefly describe how the greenhouse effect makes a planetary surface warmer than it would be otherwise
What will be an ideal response?
While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 watts during a race, how fast is the person running? Assume a running step is 1.5 m long.
What will be an ideal response?
A steel plate has a hole drilled through it. The plate is put into a furnace and heated. What happens to the size of the inside diameter of a hole as its temperature increases?
a. increases b. decreases c. remains constant d. becomes elliptical