The total number of stars in the observable universe is about
A) 100 billion.
B) the same as the number of grains of sand in a school sandbox.
C) the same as the number of grains of sand on all the beaches on Earth.
D) the same as the number of atoms that make up the Earth.
C
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Some giants and/or supergiants are less dense than air
a. True b. False Indicate whether the statement is true or false
If the temperature of an iron sphere is increased,
A) its density will increase. B) its volume will decrease. C) its density will decrease. D) its mass will decrease. E) its density will remain unchanged.
What kind of material in the solar nebula could remain solid at temperatures as high as 1,500 K, such as existed in the inner regions of the nebula?
A) rocks B) metals C) silicon-based minerals D) hydrogen compounds E) molecules such as methane and ammonia
In a relay race, runner A is carrying the baton and has a speed of 3.00 m/s. When he is 25.0 m behind the starting line, runner B starts from rest and accelerates at 0.100 m/s2
How long afterwards will A catch up with B to pass the baton to B? A) 5.17 s B) 10.0 s C) 11.9 s D) 20.4 s E) A never catches up.