If a gas cloud shrinks, its gravitational potential energy is converted into
A) chemical energy. B) thermal energy and radiative energy.
C) kinetic energy and sound waves. D) only radiative energy.
B
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The main reason that stars evolved off the main sequence is because they are becoming less massive as energy is lost into space from the proton-proton cycle
Indicate whether the statement is true or false
Inductive reactance XL is given by
A.
B.
C.
.D.
E.
A tungsten wire is used to determine the melting point of indium. The resistance of the tungsten wire is 6.000 W at 20°C and increases to 9.700 W as the indium starts to melt. atungsten = 4.50 × 10^-3 (°C)-1 . What is the melting temperature of indium?
a. 351°C c. 132°C b. 731°C d. 157°C
A small 0.050-kg insulating sphere carries a charge of -60 ?C and is hanging by a vertical silk thread from a fixed point in the ceiling
An external uniform vertical electric field is now applied. If the applied electric field has a magnitude of 3000 N/C and is directed downward, what is the tension in the silk thread? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) 0.19 N B) 0.31 N C) 0.41 N D) 0.52 N E) 0.71 N