What keeps the Sun's outer layers from continuing to fall inward in a gravitational collapse?
A) neutrinos produced by nuclear fusion drag gas outward
B) the strong force between protons
C) electromagnetic repulsion between protons
D) outward pressure due to super-heated gas
D
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About what percentage of a star's total lifetime is spent on the main sequence?
A) 10% B) 20% C) 50% D) 90% E) 100%
The specific heat capacity is highest for substances that absorb or release large quantities of heat for correspondingly
A) small temperature changes. B) large temperature changes. C) small or large changes in temperature. D) none of the above
Four unequal resistors are connected in series with each other. Which one of the following statements is correct about this combination?
A) The equivalent resistance is equal to that of any one of the resistors. B) The equivalent resistance is equal to average of the four resistances. C) The equivalent resistance is less than that of the smallest resistor. D) The equivalent resistance is less than that of the largest resistor. E) The equivalent resistance is more than the largest resistance.
If a charge generator builds a negative static charge of - how many electrons are transferred to it during this process. (e = 1.60 × 10-19 C)
A) 4.38 × 1013 B) 7.0 C) 1.12 × 10-18 D) 43.8