A spaceship is headed toward Alpha Centauri at 0.999c. According to us, the distance to Alpha Centauri is about 4 light-years. How far away is Alpha Centauri according to the travelers in the ship?
A) also about 4 light-years
B) very slightly more than 4 light-years
C) very slightly less than 4 light-years
D) quite a bit less than 4 light-years
E) quite a bit more than 4 light-years
D
A spaceship is moving past us at a speed close to the speed of light.
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The value of the momentum of a system is the same at a later time as at an earlier time if there are no
A. collisions between particles within the system. B. inelastic collisions between particles within the system. C. changes of momentum of individual particles within the system. D. internal forces acting between particles within the system. E. external forces acting on particles of the system.
Why are the rings of Saturn so bright?
A) They are made of young, fresh water ice. B) They are made of metallic iron, never rusted by exposure to oxygen. C) Light reflected off of gigantic Titan reinforces the sunlight. D) They are made of frozen metallic hydrogen. E) They are made of glassy beads expelled by the volcanoes of Enceladus.
Earth's third largest ocean is the ______________ Ocean
Fill in the blank(s) with correct word
An electron of mass 9.11 × 10^–31 kg has a momentum of 2.06 × 10^–22 kg•m/s. What is its speed?
a. 0.800c b. 0.467c c. 0.602c d. It cannot have this momentum since it would require a speed greater than c.