In the diagram below, what is the diameter of Mercury?
a. about 240 km
b. about 2400 km
c. about 24,000 km
d. about 240,000 km
e. about 2.4´106 km
B
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An ideal gas is allowed to expand slowly at constant temperature to twice its original volume. During the expansion, the gas absorbs 200 kJ of heat
(a) What is the change in the internal (thermal) energy of the gas during the expansion? (b) How much work does the gas do during the expansion? What will be an ideal response?
Where are most of the known asteroids found?
A) between the orbits of Mars and Jupiter B) in the Kuiper belt C) in the Oort cloud D) between the orbits of the jovian planets E) between the orbits of the terrestrial planets
A proton moving in a region of a space does not experience any acceleration in the direction of motion. Which of the following statements is correct with respect to this situation?
A) The electric and magnetic fields must be perpendicular to each other in that region. B) The electric and magnetic fields must be parallel to each other in that region. C) Both electric and magnetic fields must be zero in that region. D) The electric field must be zero but not the magnetic field in that region. E) The magnetic field must be zero but not the electric field in that region.
If the voltage across a resistor is doubled, the current will
a. remain the same. b. be cut to one-fourth. c. be cut in half. d. be doubled. e. be quadrupled.