Heating the air in a hot air balloon reduces the air's _________
Fill in the blank(s) with correct word
density
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Why is the Kuiper belt flat but the Oort cloud spherical?
What will be an ideal response?
How do we know the expansion of the universe is accelerating?
A) We're really not that sure the expansion is accelerating; it's all just a theory. B) The rotation curves of galaxies indicate the universe is speeding up. C) White dwarf supernova in distant galaxies are fainter than they would be if the expansion were not accelerating. D) Redshifts of distant galaxies are increasing with time, so when we repeat the measurements, the redshifts are larger. E) We see more of the universe every night, as the observable universe grows in size.
A cart starts from rest and accelerates uniformly at 4.0 m/s2 for 5.0 s. It next maintains the velocity it has reached for 10 s. Then it slows down at a steady rate of 2.0 m/s2 for 4.0 s. What is the final speed of the car?
A) 12 m/s B) 16 m/s C) 20 m/s D) 10 m/s
The Bohr radius of the hydrogen atom is 0.529 × 10-10 m. What is the radius of the n = 2 state?
A) 0.265 × 10-10 m B) 4.23 × 10-10 m C) 1.06 × 10-10 m D) 2.12 × 10-10 m E) 0.529 × 10-10 m