In a circuit made up of inductor L, resistor R, ammeter, battery, and switch in series, the current is greatest at which of the following times, as measured after the switch is closed?
a. ten time constants
c. one time constant
b. at a time t = L/R
d. zero
A
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A ruby laser beam (? = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the moon, 384,000 km away. What is the radius of the big red spot on the moon?
a. 500 m b. 250 m c. 120 m d. 1.0 km e. 2.7 km
Kirchhoff's rules are the junction rule and the loop rule. Which of the following statements is true?
a. Both rules are based on the conservation of charge. b. Both rules are based on the conservation of energy. c. The junction rule is based on the conservation of charge, and the loop rule is based on the conservation of energy. d. The junction rule is based on the conservation of energy, and the loop rule is based on the conservation of charge.
Ancient astronomers believed that Earth did not move because they saw no parallax
Indicate whether the statement is true or false
Volcanic activity on Venus is thought to be:
A) more frequent, but less violent than volcanic activity on Earth. B) more frequent and more violent than volcanic activity on Earth. C) less frequent, but more violent than volcanic activity on Earth. D) less frequent and less violent than volcanic activity on Earth. E) the same as volcanic activity on Earth.