Hydrogen lines are weaker in both very hot and very cool stars
Indicate whether the statement is true or false
TRUE
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An unfueled 1000-kg experimental rocket sled at rest on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20 s "burn.". The rocket moves at 160 m/s after the burn. What average force is experienced by the rocket during the burn?
a. 0.80 × 10^4 N b. 0.75 × 10^4 N c. 0.60 × 10^4 N d. 0.35 × 10^4 N
The elements that we are all made of are common everywhere in the observable Universe
a. True b. False Indicate whether the statement is true or false
What distance methods is used to calibrate the Hubble constant?
a. Parallax b. Supernova observations c. variable stars d. both a and b e. both b and c
_________corrosion is the dissolution of a metal that occurs when it is electrically connected to a more noble metal in an electrolyte.
Fill in the blank(s) with the appropriate word(s).