Through how many degrees does a 33 rpm turntable rotate in
A) 35° B) 74° C) 63° D) 46°
C
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A steel pipe (E 5 190 GPa, ? 5 14 3 1026/°C, d2 5 82 mm, and d1 5 70 mm) of length L 5 4.25 m hangs from a rigid surface and is subjected to a temperature increase ¢T 5 50 °C. The column is fixed at the top and has a small gap at the bottom. To avoid buckling, the mini-mum clearance at the bottom should be approximately:
(A) 2.55 mm
(B) 3.24 mm
(C) 4.17 mm
(D) 5.23 mm
The temperature of a quantity of ideal gas in a sealed container is increased from 0°C to 273°C. What happens to the rms speed of the molecules of the gas as a result of this temperature increase?
a. It does not change since rms speed is independent of temperature. b. It increases but it less than doubles. c. It doubles. d. It quadruples.
Ross 128 is 1.1 times further than Ross 154 . As such, the parallax angle of Ross 128 is 0.9 times larger than Ross 154
a. True b. False Indicate whether the statement is true or false
Which of the following is not one of the three major categories of galaxies?
A) irregular galaxies B) elliptical galaxies C) globular galaxies D) spiral galaxies