During a thunderstorm, an observer notes that 10 s elapsed between the lightning flash and the sound of the thunder. What is the approximate distance, in miles, from the observer to the lightning?
a. 10 mi
b. 50 mi
c. 2 mi
d. 100 mi
c
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The highest-strength aluminum alloys, such as 7075-T6, are strengthened by _________-hardening.
Fill in the blank(s) with the appropriate word(s).
In a binary system containing two neutron stars, the objects will ____
a. radiate orbital energy away as gravitational radiation and move farther apart b. radiate orbital energy away as gravitational radiation and move closer together c. exchange mass until their orbital periods become equal d. exchange mass until they are in synchronous rotation e. exchange angular momentum, lengthening the period of the pulsar
Neptune was discovered due to irregularities in Uranus' orbit. At closest approach, these two planets are about 10 AU apart
a) What is the force of gravity between these two objects? b) How does that compare to the force of gravity between the Sun and Uranus (approximately 20 AU from the Sun)?
Including relativistic effects, doubling the speed of a object:
a. has no effect on its momentum. c. less than doubles its momentum. b. more than doubles its momentum. d. doubles its momentum.