Approximately how much air is in a column 1-cm2 in cross section that extends from sea level to the top of the atmosphere?
A) 1 gram
B) 1 kg
C) 10 kg
D) 100 kg
Answer: B
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Specific Heat: Object 1 has three times the specific heat capacity and four times the mass of Object 2. The two objects are heated from the same initial temperature, T0, to the same final temperature Tf. During this process, if Object 1 absorbs heat Q, the amount of heat absorbed by Object 2 will be
A. 12Q.
B. 6Q.
C. 
Q.
D. 
Q.
E. 
Q.
Anne S. Moffat, in a paper in Science "Engineering plants to cope with metals" (Ref. 41) says: "Many plants cope with
metals by binding them in complexes with a class of peptides called phytochelatins and sequestering the complexes inside their cells. Now three groups have isolated genes for the enzymes, called phytochelatin synthases, that make the metal-binding peptides when the cell is exposed to toxic metals. ... After searching genome databases, they also found counterparts of the plant genes in the roundworm Caenorhabditis elegans." What are the implications of finding the same genes to inactivate metals in both plants and animals?
Yellow dwarfs have ________ spectral lines than red giants.
A. wider B. narrower C. weaker D. stronger
An electric motor produces 2.0 hp in a Vrms = 120 V circuit. Using 1 hp = 746 W, how long would it take this motor to do 1.0 kWh of work?
a. 0.67 min b. 0.67 h c. 1.3 min d. 1.3 h