Hydrogen lines are weaker in both very hot and very cool stars

Indicate whether the statement is true or false


TRUE

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

_________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).

Physics & Space Science