In the apparatus shown in figure Q4.1a, the value displayed by the ammeter is proportional to 
A. The rate at which electrons emerge from the cathode.
B. The average kinetic energy of the ejected electrons.
C. The maximum kinetic energy of the ejected electrons.
D. Both A and C.
A. The rate at which electrons emerge from the cathode.
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Why does the temperature of the gas between galaxies in galaxy clusters tell us about the mass of the cluster?
A) The temperature tells us the average speeds of the gas particles, which are held in the cluster by gravity, so we can use these speeds to determine the cluster mass. B) The temperature of the gas tells us the gas density, so we can use the density to determine the cluster's mass. C) Temperature is always directly related to mass, which is why massive objects are always hotter than less massive objects. D) The question is nonsense—gas temperature cannot possibly tell us anything about mass.
A 480-kg car moving at 14.4 m/s hits from behind a 570-kg car moving at 13.3 m/s in the same direction
If the new speed of the heavier car is 14.0 m/s, what is the speed of the lighter car after the collision, assuming that any unbalanced forces on the system are negligibly small? A) 10.5 m/s B) 13.6 m/s C) 19.9 m/s D) 5.24 m/s
If a hydrocarbon is not aliphatic, it is ______________
Fill in the blank(s) with correct word
The temperature at which a parcel of air becomes saturated and condensation begins is called the _______.
What will be an ideal response?