Which of the following is true of ribonucleic acid (RNA)?
A) It carries the genetic code out of the nucleus.
B) It remains safe in the nucleus of a cell.
C) It is the building block of compounds such as proteins and carbohydrates.
D) It is a long spiral molecule that stores the genetic code.
A
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If ? = 90° ? ?, what is the value of sin2 ? + sin2 ??
a. 0 b. 1 c. ?1 d. The answer depends on ?.
A flashlight draws 0.133 A from a 3.0-V battery pack
In 2.0 minutes (a) how much charge flows from the battery, (b) how much energy does the battery supply, and (c) how many electrons have passed any point in the circuit every second?
The highest-temperature aircraft gas-turbine blades are made from
(a) Tungsten (b) Single crystals of nickel-based alloys (c) Polycrystals of nickel-based alloys (d) Alumina
Suppose you launch two probes in opposite directions from the Space Station and they meet as they orbit Earth. According to general relativity, why does this happen?
A) They are following the straightest possible paths through spacetime, and those paths curve so that the probes meet. B) They are following the allowed orbits according to Newton's universal law of gravitation. C) The force of gravity tugs on the probes and forces them to orbit the Earth. D) Objects launched in space always follow circular paths, no matter where they are.