The total mass of galaxies in a cluster of galaxies divided by the number of galaxies in the cluster can be used to determine a typical galaxy's ___________
a. luminosity
b. distance
c. mass
d. diameter
e. age
c
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The diagram below is an HR diagram. The line indicates the location of the main sequence. Which of the five labeled locations on the HR diagram indicates a luminosity and temperature similar to that of a T Tauri star?
a.
1
b.
2
c.
3
d.
4
e.
5
Answer the following statement(s) true (T) or false (F)
The direction of the net force on a small magnet will be the same if the SG axis is reversed and the effect of the external magnet decreases in the axis direction instead of increasing.
Why do hot water heaters lose their efficiency quicker in households with hard water?
A) The hard water calcium and magnesium ions corrode the heating element. B) The hard water calcium carbonate deposits oxidize the inner tank wall. C) The calcium carbonate on the inner surface of the hot water tank builds up to the point that it insulates the water from the heating element. D) The hard water calcium ions exchange with iron ions from the inner metal wall which react with the water heater base to form rust and deteriorate the bottom of the tank.
What is the power needed to change the speed of a 1600-kg sport utility vehicle from 15.0 m/s to 40.0 m/s in 4.00 seconds?
A) 100 kW B) 10.0 kW C) 140 kW D) 14.0 kW E) 275 kW