Ohm's Law: A 12-V battery is connected across a 100-? resistor. How many electrons flow through the wire in 1.0 min? (e = 1.60 × 10-19 C)
A. 1.5 × 1019
B. 2.5 × 1019
C. 3.5 × 1019
D. 4.5 × 1019
Answer: D
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An atom can get the energy that moves an electron to a higher energy level by:
A) absorbing a photon of electromagnetic radiation. B) preventing collisions with other atoms. C) moving the electron to a tightly bound level. D) transferring the electron to the ground state.
Describe what occurred during the period of decoupling
What will be an ideal response?
Physical Pendulum: A Christmas ornament made from a thin hollow glass sphere hangs from a small hook at its surface. It is observed to oscillate with a frequency of 2.50 Hz in a city where g = 9.80 m/s2. What is the radius of the ornament? The moment of inertia of a hollow sphere of mass M and radius R about a point on its edge is 5MR2/3.
A. 1.84 cm B. 3.68 cm C. 2.38 cm D. 3.98 cm E. 4.69 cm
The outward pressure of hot gas in the Sun
A) is balanced by the inward gravitational pressure. B) is increasing the Sun's diameter. C) is cooling the photosphere. D) is responsible for variations in the sunspot cycle. E) weakens the magnetic field.