If it takes 7 N to stretch a spring 8 cm and if the spring is then cut in half, what force does it take to stretch one of the halves 4 cm?
a. 3.5 N
b. 7 N
c. 14 N
d. 21 N
e. 28 N
b
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LR Circuits: A resistor and an inductor are connected in series to a battery. The battery is suddenly removed from the circuit and replaced by a wire to complete the circuit. The time constant for of the new circuit represents the time required for the current to decrease to
A. 25% of the original value. B. 37% of the original value. C. 63% of the original value. D. 75% of the original value. E. zero.
An incandescent bulb emits what kind of spectrum?
A. emission-line B. blueshifted C. continuous D. absorption-line E. redshifted
Based on what you learn about jovian moons by watching the videos or reading your textbook, what types of evidence for recent or ongoing geological activity have been observed on one or more jovian moons?
a. ice crystals being sprayed out into space b. surfaces with very few impact craters c. river valleys feeding into surface lakes of very cold liquids d. active volcanoes e. river valleys feeding into surface lakes of liquid water f. large, violent storms swirling in counterclockwise directions
The thermal pressure of a gas depends on
A) density only. B) temperature only. C) density and temperature. D) composition. E) gravity.