A parallel plate capacitor with circular plates having radius 0.07 m and a dielectric with constant 2.2. If it is desired to store 
J in this capacitor, what must the separation distance be for a voltage of 1.5 kV?
A. 2.8 cm
B. 5.5 cm
C. 1.3 cm
D. 0.90 cm
E. 1.4 cm
A. 2.8 cm
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Eclipses can occur only when, viewed from Earth, the Sun is near one of the ____ of the Moon's orbit
a. nodes b. points c. phases d. paths e. ecliptics
This photo was taken from orbit around some planet. What planet is it, and how do you know?
A) Mars because we see dried up riverbeds B) the Moon because it has craters C) Venus because of its yellowish color D) Mercury because we see gigantic cliffs
A rock is projected from the edge of the top of a building with an initial velocity of 12.2 m/s at an angle of 53° above the horizontal. The rock strikes the ground a horizontal distance of 25 m from the base of the building. Assume that the ground is level and that the side of the building is vertical. How tall is the building?
A. 25.3 m B. 29.6 m C. 27.4 m D. 23.6 m E. 18.9 m
Olbers' paradox is an apparently simple question, but its resolution suggests that the universe is finite in age. What is the simple question posed by Olbers' paradox?
A) Why is the sky dark at night? B) What would it be like to ride on a beam of light? C) How does the Sun produce energy? D) Can we measure the position and momentum of an electron at the same time? E) How many stars are in the universe?