What is the equivalent resistance between points a and b when R = 30 ??
a.
27 ?
b.
21 ?
c.
24 ?
d.
18 ?
e.
7.5 ?
d
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The three point charges +4.0 ?C, -5.0 ?C, and -9.0 ?C are placed on the x-axis at the points x = 0 cm, x = 40 cm,
and x = 120 cm, respectively. What is the x component of the net electrostatic force exerted on the -9.0 ?C charge by the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) -0.55 N B) 0.55 N C) 0.64 N D) 0.41 N E) -0.41 N
What would happen to the planets in a solar system where the central star did not have a strong wind?
A) Nothing, the star does not affect the process of planet formation. B) One planet would grow to dominate all the others and gravitationally eject them out of the system. C) All planets would continue to grow to large sizes but their orbits would be unchanged. D) The gas in the solar nebula would create a drag on the planets and their orbits would migrate inwards. E) The gas in the solar nebula would create a drag on the planets and their orbits would migrate outwards.
The accident at Three Mile Island began when
A) the moderator malfunctioned so that the reaction got out of control. B) a water pump failed. C) the control rods didn't insert properly. D) the pressurizer ruptured [i.e., broke open] and there was no backup pressurizer to replace it. E) the heat exchanger failed to operate properly.
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C The 1 kg block of ice melts into water. The amount of heat absorbed by the ice as it melts is
a. 2,000 J b. 4,000 J c. 20,000 J d. 40,000 J e. 334,000 J