2. What is the average power input to the wheel during this time interval?
(A)
(B)
(C)
(D)
(E)

13. If plant cells are grown on media containing radioactively labeled thymine for one generation, radioactively labeled macromolecules will be detected in which of the following? (A)only in the nucleus (B)only in the nucleus and mitochondria (C)only in the nucleus and chloroplasts (D) in the nucleus, mitochondria, and chloroplasts

14. Most cells cannot harness heat to perform work because_________.(A)heat is not a form of energy(B)temperature is usually uniform throughout a cell(C)heat can never be used to do work(D) heat must remain constant during work

15. Research on conditions that are relatively new to human populations such as myopia, breast cancer, and obesity support the conclusion that_________. (A)human populations have accumulated a number of mutations that have become fixed by genetic drift (B)the changes in human lifestyle account for all of the increase in frequencies of these conditions (C)these conditions are indeed "diseases of civilization" and are likely caused by the interaction between genes (genetic susceptibility) and novel environments (D) these human conditions are mere artifacts of the way in which they have been evaluated

1. What is the average net torque on the wheel during this time interval?(A) (B)(C) (D)(E)

3. What is the ratio of (A) 2½ (B) (C) (D) (E)

4. What is the entropy change along the A to D process? (A) nCvln2 (B) nCvln3/2 (C) nCvln2(D) (E) 0

5. What is the total heat transferred during the full cycle?(A) 5nRT₁ (B) 2nRT₁ln3 (C) 2nRT₂ln2 (D) 5nRT₁ln2 (E) 6nRT₂ln3

6. What is the efficiency of this engine? (A) (B) (C)(D) (E)

7. What is the acceleration of the cylinder as it rolls down the incline?(A)gsinθ (B)gcosθ (C)gcosθ (D)gtanθ (E)gtanθ

8. What is the minimum coefficient of friction necessary for the cylinder to roll without slipping down the ramp? (A)(B) (C) (D) (E)