A molecule takes 3.0 seconds to diffuse across a membrane. If the thickness of the membrane is doubled, then how long does it take the molecule to diffuse across the thicker membrane?
A. 30 hours
B. 24 hours
C. 20 hours
D. 18 hours
E. 12 hours
E. 12 hours
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According to Aristotle, an object with no forces acting on it will ____
a. move faster and faster b. eventually stop moving c. move at a constant speed forever d. first increase and then decrease in speed e. first decrease and then increase in speed
Simple Pendulum: A simple pendulum and a mass oscillating on an ideal spring both have period T in an elevator at rest. If the elevator now moves downward at a uniform 2 m/s, what is true about the periods of these two systems?
A. Both periods would remain the same. B. Both periods would increase. C. Both periods would decrease. D. The period of the pendulum would increase but the period of the spring would stay the same. E. The period of the pendulum would decrease but the period of the spring would stay the same.
The following images show four planets in our solar system. Rank these planets from left to right based on the number of moons that orbit them, from highest to lowest. (Not to scale.)
What will be an ideal response?
A violation of the second law of thermodynamics would occur if
A. a ball lying on the ground started to bounce. B. transfer of energy by heat moved energy from an object at low temperature to an object at a higher temperature. C. a refrigerator heated the air in the room in which the refrigerator is located. D. any of the above occurred. E. (a) or (b) occurred, but not (c).