The total mass of all the asteroids in the asteroid belt combined is
A) less than that of any terrestrial planet.
B) about the same as that of Earth.
C) about twice that of Earth.
D) about the same as that of Jupiter.
E) more than that of all the planets combined.
A) less than that of any terrestrial planet.
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Using an orbit size of 8 kpc, and a period of 225 million years, the mass of our Galaxy is found to be closest to:
A) 106 solar masses. B) 108 solar masses. C) 1010 solar masses. D) 1011 solar masses. E) 1012 solar masses.
A battery charges a parallel-plate capacitor fully and then is removed. The plates are then slowly pulled apart. What happens to the potential difference between the plates as they are being separated?
A) It increases. B) It decreases. C) It remains constant. D) It cannot be determined from the information given.
The only metal that does not oxidize is _________.
Fill in the blank(s) with the appropriate word(s).
An ac source of period T and maximum voltage V is connected to a single unknown element. At time t = 0 the voltage is zero. At time t = T/4 the current in the unknown element is equal to zero, and at time t = T/2 the current is I = - Imax where Imax is the current amplitude. What is the unknown element?
A) a resistor B) an inductor C) a capacitor D) an inductor or a capacitor E) More information is needed to identify the element.