Terminal Voltage and Internal Resistance: A 7.0-? resistor is connected across the terminals of a battery having an internal emf of 10 V. If 0.50-A current flows, what is the internal resistance of the battery?
A. 13 ?
B. 20 ?
C. 10.8 ?
D. 27.0 ?
Answer: A
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According to the Stefan–Boltzmann law, an object at room temperature that is sitting in a room (also at room temperature) must emit electromagnetic radiation. Since it is losing energy by emitting this radiation, why does its temperature remain constant?
A. It receives heat by conduction from the air and from what it is sitting on. B. It receives heat by convection from the air. C. It receives heat by radiation from objects in the room. D. All of the above. E. Its temperature actually does decrease. F. It does not actually emit any radiation. T. Some other explanation (specify)
A bullet fired horizontally from a rifle begins to fall
A) as soon as it leaves the barrel. B) after air friction reduces its speed. C) neither of these
Most of the larger moons of gas giants were formed at the same time as the gas giants, but somewhere else in the Solar System, and captured by the gas giants later.
Answer the following statement true (T) or false (F)
How many atoms are present in a sample of pure iron with a mass of 210 g? (The atomic mass of iron = 56 u and NA = 6.02 × 10^23.)
a. 1.8 × 10^19 c. 2.3 × 10^24 b. 2.3 × 10^28 d. 3.2 × 10^28