How does the size of a planet determine its internal temperature?
What will be an ideal response?
Size is the most important factor in determining how rapidly a planet loses its internal heat. The larger a planet is, the deeper is the "insulation" that surrounds the core and keeps in the heat.
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What process in Earth's core is important in the generation of Earth's magnetic field?
a. accretion b. differentiation c. convection d. eruption e. gravitation
A large water storage container is filled to a depth of 3.0 m. The volume above the water is filled with air. In order to pump the water from the container, the air pressure in the container is increased by 3.0 
105 N/m2. What happens to the pressure in the water at a depth of 1.0 m when the air pressure is increased?
A.
B.
105 N/m2, since it is at 1/3 the depth of the water.C.
105 N/m2, since it is at 2/3 the depth from the bottom of the container.D.
105 N/m2.E.
105 N/m2 + 9.8 
103 N/m2 since it is 1.0 m deep in the water.An electron is released from rest at the negative plate of a parallel-plate capacitor. If the distance across the plate is 2.0 mm and the potential difference across the plate is 6.0 V, with what velocity does the electron hit the positive plate? (me = 9.1 × 10^?31 kg, e = 1.6 × 10^?19 C)
a. 2.1E+5 m/s b. 1.5E+12 m/s c. 5.3E+5 m/s d. 1.5E+6 m/s e. 2.1E+6 m/s
A telescope is set up in introductory physics lab using a 10 cm lens and a 50 cm lens. Since both lenses are the same diameter it is not evident which one to use as the eyepiece and which one to use as the objective. If one uses the 50 cm lens as the eyepiece, what power results?
a. 
b. 
c. 
d. 
e. one cannot look through the system in this direction