What is the ratio of potential energy to kinetic energy for a comet that has just enough energy to escape from the Sun's gravitational field?
A) 1/2
B) 1
C) 2
D) -1
E) -2
D
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Characteristics of Waves: The figure shows a "snapshot" of a wave at a given instant of time. The frequency of this wave is 120 Hz. What are the (a) amplitude, (b) wavelength, and (c) speed of this wave?
What will be an ideal response?
This photo shows the Large Magellanic Cloud, or LMC for short. Based on what you have learned in about the LMC from your text, which of the following statements about the LMC is not true?
A) Galaxies similar to the LMC are extremely rare. B) It is an irregular galaxy. C) It orbits the Milky Way Galaxy. D) Its color indicates active star formation.
A concave mirror has a focal length of 20 cm. What is the position (in cm) of the resulting image if the image is inverted and four times smaller than the object?
a. 15 b. 25 c. 50 d. 100 e. ?15
When an object is effectively isolated from external torques, like an ice skater twirling on the tip of one skate, the angular momentum of the object
a. can be increased by shifting mass out away from the axis of rotation. b. can be decreased by shifting mass out away from the axis of rotation. c. can be increased by shifting mass in toward the axis of rotation. d. can be decreased by shifting mass in toward the axis of rotation. e. cannot be changed except by friction at the point of contact.