Hubble's law is not applicable to ________ because the motion of these galaxies is affected by ________.
A. galaxies in the Local Group; gravitational interaction with the Milky Way
B. distant galaxies; intervening dust
C. spiral galaxies; their spiral arms
D. elliptical galaxies; their rotation
Answer: A
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A spaceship moves over my driveway at a relativistic speed. I observe that my driveway is the same length as the ship. I then conclude that the rest length of my driveway is ________ the rest length of the spaceship.
A. greater than B. less than C. the same as
When a spinning ice skater pulls in his arms, he spins faster because
A) his angular momentum must be conserved, so reducing his radius must increase his speed of rotation. B) there is less friction with the air. C) there is less friction with the ice. D) there exists an unbalanced reaction force.
Which of these, both of the same length, has the greater electrical resistance?
A) a thick copper wire B) a thin copper wire C) both about the same D) need more information
What is the gravitational force on a 20-kg satellite circling the Earth (radius = 6.4 × 106 m, mass = 6.0 × 1024 kg) with a period of 5.0 h?
A. 88 N B. 55 N C. 36 N D. 98 N E. 18 N