Which statement about spiral galaxies is FALSE?
A) most of their star formation occurs in the spiral arms
B) their disks rotate at more than 100 kilometers per second
C) a type "c" spiral has tight, smooth arms
D) a type "a" spiral has a large bulge compared to a type "c" spiral
E) a merger of two spiral galaxies may give rise to an elliptical galaxy
Ans: C) a type "c" spiral has tight, smooth arms
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A heat-conducting rod that is wrapped in insulation is constructed with a 0.15-m length of alloy A and a 0.40-m length of alloy B, joined end-to-end. Both pieces have cross-sectional areas of 0.0020 m2
The thermal conductivity of alloy B is known to be 1.8 times as great as that for alloy A. The end of the rod in alloy A is maintained at a temperature of 10°C, and the other end of the rod is maintained at an unknown temperature. When steady state flow has been established, the temperature at the junction of the alloys is measured to be 40° C, and the rate of heat flow in the rod is measured at 56 W. What is the temperature of the end of the rod in alloy B? A) 80°C B) 84°C C) 88°C D) 92°C E) 96°C
Energy and Mass: The total energy of a moving electron is 0.758 MeV. What is the speed of the electron in terms of c? The mass energy of an electron is 0.511 MeV.
A. 0.739 c B. 0.794 c C. 0.306 c D. 0.933 c
Our Sun should become a planetary nebula in another five billion years
Indicate whether the statement is true or false
Time-dependent plastic strain is _________strain.
Fill in the blank(s) with the appropriate word(s).