Which of the following is smallest?
A) size of a typical planet
B) 1 light-second
C) 1 AU
D) size of a typical star
A
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Two stars of the same spectral class must have the same
a. radius. b. temperature. c. mass. d. distance. e. all of the other choices.
Solid argon has a density of 1650 kg/m3 . The atomic weight of argon is 40.0 . Assuming each atom occupies a cubical volume, what is the distance between the argon atoms?
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
An object, located 90 cm from a concave lens, forms an image 30 cm from the lens on the same side as the object. What is the focal length of the lens?
a. -150 cm c. -36 cm b. -45 cm d. -180 cm