Mare Imbrium is the result of a planetesimal of 275 km across striking the lunar surface 4 billion years ago
a. True
b. False
Indicate whether the statement is true or false
True
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An unfueled 1000-kg experimental rocket sled on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20 s "burn.". If the rocket, initially at rest, moves at 160 m/s after the burn, what impulse is experienced by the rocket sled?
a. 1.1 × 10^5 kg•m/s c. 1.5 × 10^5 kg•m/s b. 1.6 × 10^5 kg•m/s d. 1.9 × 10^5 kg•m/s
When a solid changes to a liquid and then to a gas, energy is
1) released, 2) absorbed, and when gas changes to liquid and then to solid, energy is 3) released. 4) absorbed.
What observation made of other stars seems to suggest the solar nebula hypothesis is correct?
a. Stars are found to exist more often in binaries than by themselves. b. Protostars are seen to radiate much of their light at infrared wavelengths. c. Nearby stars tend to be low mass red dwarfs. d. Young stars are found to have hot disks that surround them.
A length of organ pipe is closed at one end. If the speed of sound is 344 m/s, what length of pipe (in cm) is needed to obtain a fundamental frequency of 50 Hz?
A. 28 B. 86 C. 344 D. 172 E. 688