If the dust around a protostar radiates most strongly at 30 microns or 30,000 nm, what is the approximate temperature of that dust? Hint: T in K =3,000,000/wavelength in nm
a. 100,000 K
b. 10,000 K
c. 1000 K
d. 100 K
e. 10 K
D
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Now consider Object 2. What can you say about Object 2 in comparison to Object 1?
A) Object 2 is moving away from us faster than Object 1. B) Object 2 contains more hydrogen than Object 1. C) Object 1 had a higher temperature than Object 2. D) Object 2 is moving toward us while Object 1 is moving away from us.
Which one of the following reactions is the most similar chemically to combustion?
A) fusion in stars B) vaporization in the atmosphere C) respiration in animals D) fission in nuclear reactors E) photosynthesis in plants
A 20-g bullet moving at 1000 m/s is fired through a one-kg block of wood emerging at a speed of 200 m/s. What is the change in the kinetic energy of the bullet-block system as a result of the collision assuming the block is free to move?
a. 0 J c. 9.5 kJ b. -9.5 kJ d. -18 J
Encephalization Quotient (EQ) values can be estimated for extinct species because
A) there is a linear relationship between the EQ and time, thus allowing extrapolation B) extinct species always have the same EQ value C) we can estimate their body masses from their fossilized remains and their brain masses from the sizes of their fossilized cranial cavities D) we can always find similar species in existence today to make measurements of