An amount of work equal to 2.0 J is required to compress the spring in a spring-gun. What is the "launch speed" of a 26.0-g marble?
a. 12.4 m/s
b. 13.4 m/s
c. 8.8 m/s
d. 3.92 m/s
e. 0.392 m/s
a
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A system of terrestrial-sized planets has been detected in orbit around a millisecond pulsar
Indicate whether the statement is true or false
How do we know that chlorine caused the ozone hole?
A) From measurements of the relationship between the experimental release of chlorine from the land surface in Antarctica, and the depletion of ozone that appeared in the atmosphere a few days later. B) From laboratory experiments involving a replica of the atmosphere over Antarctica. C) From the relationship between the release of chlorine by the Pinatubo volcano and the depletion of ozone over Antarctica a few months later. D) From theories of the chemical destruction of ozone, coupled with computer calculations. E) From measurements of chlorine monoxide and ozone in the Antarctic atmosphere as the sun reappeared in the spring.
A buzzer with frequency f0 is thrown straight upwards. On the buzzer's trip down, what is the frequency behavior heard by an observer below?
a. The frequency heard is still f0. b. The frequency is a constant one greater than f0. c. The frequency is an increasing one greater than f0. d. The frequency is a decreasing one less than f0.
How much energy (in eV) does a photon of 500-nm light have? (h = 6.63 × 10^-34 J×s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^-19 J, and 1 nm = 10-9 m)
a. 1.78 eV c. 1.24 eV b. 2.48 eV d. 3.11 eV