Which of the following two stick structures are different conformations of the same molecule?
A) a and c
B) b and c
C) a and d
D) b and d
E) none of the above
Answer: B
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Would bile salts be effective if they were polar molecules instead of amphiphilic molecules?
A. If bile salts were polar molecules they would be effective because they will be able to interact with the micelle. B. If bile salts were polar molecules they would be ineffective because they would not be able to interact with water molecules. C. If bile salts were polar molecules they would be effective because they will be attracted to the fatty acid tails of the lipids. D. If bile salts were polar molecules they would be ineffective because they would not be able to interact with lipids.
A crate of weight w is being pushed across a horizontal surface by a force directed at an angle of 20° below the horizontal. What is the magnitude of the normal force on the crate?
a. It is less than w. b. It equals w. c. It is more than w. d. None of the above since the coefficient of kinetic friction is not given.
A rectangular loop of wire of width 10 cm and length 20 cm has a current of 2.5 A flowing through it. Two sides of the loop are oriented parallel to a uniform magnetic field of strength 0.037 T,
the other two sides being perpendicular to the magnetic field. The magnitude of the torque on the loop is A) 0.0093 m?N. B) 0.025 m?N. C) 0.050 m?N. D) 0.0019 m?N. E) 0.038 m?N.
If the breakers at a beach are separated by 5.0 m and hit shore with a frequency of 0.20 Hz, with what speed are they traveling?