A blimp is filled with 200 m3 of helium. How much mass can the balloon lift? The density of helium is one-seventh that of air, and the density of air is 1/800 that of water. Consider the mass of the balloon to be negligible
a. 115 kg
b. 214 kg
c. 315 kg
d. 415 kg
e. 37 kg
b
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During the hydrogen shell burning phase
A) the star grows more luminous. B) the star becomes less luminous. C) helium is burning in the core. D) the core is expanding. E) hydrogen is burning in the central core.
Two point charges are on the x-axis. One charge, 
is located at the origin, and the other charge, 
is located at x = 9.00 m. What is the force on 
?
A. 20.0 nN in the positive x-direction B. 20.0 pN in the positive x-direction C. 20.0 nN in the negative x-direction D. 20.0 pN in the negative x-direction E. 180 nN in the positive x-direction
What is the approximate temperature of the universe (as a whole) today?
A) 3K B) 3000K C) 300K D) The universe cannot be said to have a single temperature.
Given 3 capacitors: 4.00 ?F, 7.00 ?F, and 9.00 ?F; what is the equivalent capacity if they are connected in series?
What will be an ideal response?