To illustrate regelation with ice it is important that a
A) wire is used.
B) string is used.
C) either of these
D) none of the above
Answer: A
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All the statements below are true. Which one gives the primary reason why the surface of Venus today is some 450°C hotter than the surface of Earth?
A) Venus has a much stronger greenhouse effect than Earth. B) Venus is only about 73% as far from the Sun as Earth. C) Venus has a much higher reflectivity than Earth. D) Venus has a higher atmospheric pressure than Earth.
All galaxies are expanding away from every other galaxy in the universe in a manner similar to
A. a telephone that is on hold. B. dots of ink on a balloon that is being inflated at a birthday party. C. pancake syrup on a pancake on Saturday morning. D. a tape recording that is played backwards at double speed.
A 4.0-g string is 0.36 m long and is under tension. The string vibrates at 500 Hz in its third harmonic. What is the wavelength of the standing wave in the string?
A) 0.24 m B) 0.36 m C) 0.54 m D) 0.72 m E) 0.90 m
The search for black holes involves searching for
a. single stars that emit large amounts of X-rays. b. X-ray binaries where the compact companion has a mass in excess of 3 . c. large spherical regions from which no light is detected. d. pulsars with periods less than one millisecond. e. pulsars that are orbited by planets.