Which of the following objects is considered to possibly contain a black hole?
a. the central star of the Crab nebula
b. the Orion nebula.
c. LMC X-3
d. Algol
e. PSR 1257+12
c
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Which internal heat source still generates heat within the terrestrial worlds today?
A) heat from radioactive decay B) heat of accretion C) heat from differentiation D) heat from convection
As life on Earth evolved, its DNA
A) changed gradually into RNA B) stayed the same C) became gradually less complex D) became gradually more complex
If a 20-kg object dropped in air has a terminal speed of 60 m/s, what was its acceleration at 30 m/s?
a. 9.80 m/s2 b. 7.35 m/s2 c. 4.90 m/s2 d. 2.45 m/s2 e. More information is needed to answer this question.
How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10-19 J, mH ? mproton = 1.67 × 10-27 kg)
A) 44.2 km/s B) 21.7 km/s C) 66.5 km/s D) 113 km/s E) 51.0 km/s