A marble has a diameter of 2 cm. At what distance would the marble have an angular diameter of 1 arc second?
a. 4.1 cm
b. 4.1 miles
c. 4.1 m
d. 4.1 ft
e. 4.1 km
e
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A chimney is constructed of square concrete blocks with a round flue as shown in Figure 2-56. Estimate the heat loss through the cement blocks per meter of chimney if the outer surface temperature is -10ºC and the inner surface temperature is 150ºC.
Spectroscopic parallax is more accurate than trigonometric parallax for nearby stars
Indicate whether the statement is true or false
If the speed of light were infinite but the postulates of special relativity still held, then
A. time dilation would be obvious at low speeds. B. length contraction would not occur. C. objects could have negative kinetic energy. D. any moving object would have infinite momentum.
Polymers are formed from fundamental repeating units called
a. groups. b. amino acids. c. complexes. d. monomers.