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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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.
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