A ball is thrown vertically upwards at 9.8 m/s. For its complete trip (up and back down to the starting position), its average velocity is:
a. 19.6 m/s.
c. 4.90 m/s.
b. 9.80 m/s.
d. not given.
D
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Which of the following will increase the capacitance of a parallel plate capacitor?
A) a decrease in the plate area and an increase in the plate separation B) a decrease in the potential difference between the plates C) an increase in the potential difference between the plates D) an increase in the plate area and a decrease in the plate separation E) none of the above
A rocket of total mass M and with burnout mass 0.20M attains a speed of 3 400 m/s after starting from rest in deep space. What is the exhaust velocity of the rocket?
a. 6.8E+2 m/s b. 2.1E+3 m/s c. 1.7E+4 m/s d. 2.2E+3 m/s e. 1.1E+3 m/s
The principal greenhouse gases in our present atmosphere are:
A) hydrogen and helium. B) hydrogen sulfide and carbon disulfide. C) water vapor and carbon dioxide. D) methane and ammonia. E) sulfuric acid vapor and carbon dioxide.
A charge Q accumulates on the hollow metallic dome, of radius R, of a Van de Graaff generator. A probe measures the electric field strength at various points outside the sphere's surface. By what factor will the electric field value at the 2R distance be changed if the charge value were increased to (5/3)Q?
a. 3/5 c. 5/3 b. (5/3)2 d. (3/5)2