Kirchhoff's Rules: In the circuit shown in the figure, R1 = 10 ?, R2 = 12 ?, R3 = 20 ?, V1 = 1.0 V, V2 = 7.0 V, and the batteries are both ideal. What is the current through R1?
A. 0.60 A
B. 0.80 A
C. 0.18 A
D. 0.13 A
Answer: A
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Fraud in science is rare because it is difficult to commit. Why is it difficult to commit fraud in science?
a. Science requires that experimental and theoretical findings be reproducible. b. All scientists are bound by a code of ethics preventing them from publishing fraudulent work. c. Scientific results are reviewed by other scientists before they are published. d. Scientific journals only allow certain highly trusted individuals to publish their work. e. Science requires that experimental and theoretical findings be reproducible and scientific results are reviewed by other scientists before they are published.
The disk of the Milky Way is approximately 20,000 ly in diameter
a. True b. False Indicate whether the statement is true or false
General Questions: You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train. From this observation, you can conclude that this train is
A. speeding up. B. slowing down. C. changing direction. D. speeding up and changing direction. E. slowing down and changing direction.
A uniform rod of mass M = 1.2 kg and length L = 0.80 m, lying on a frictionless horizontal plane, is free to pivot about a vertical axis through one end, as shown. The rotational inertia of the rod about this axis is given by (1/3)ML2. If a force (F = 5.0 N, ? = 40°) acts as shown, what is the resulting angular acceleration about the pivot point?
?
?
A. 16 rad/s2 B. 12 rad/s2 C. 14 rad/s2 D. 10 rad/s2 E. 33 rad/s2