Power: When a 14.0-A current flows through an 8.00-? device for 24.0 hours, how much does this cost if energy costs $0.0900 per kW ? h?
A. $0.24
B. $1.04
C. $2.16
D. $3.39
Answer: D
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What is the equivalent resistance between points A and B in the figure when R = 20 ??
A. 77 ? B. 63 ? C. 70 ? D. 84 ? E. 140 ?
A mass of 4.5 kg, resting on a horizontal frictionless surface, is attached on the right to a horizontal spring with spring constant 29 N/m and on the left to a horizontal spring with spring constant 60 N/m. If this system is moved from equilibrium, what is the effective spring constant?
a. –31 N/m b. 31 N/m c. 89 N/m d. –89 N/m e. 16 N/m
The average binding energy per nucleon is the best parameter to use in determining whether a given nucleus is likely to undergo fission
What will be an ideal response?
Which of the following features is not a feature of central dominant galaxies?
A) They are often spiral galaxies. B) They often have multiple galactic nuclei near their centers. C) They are thought to form by the merger of several smaller galaxies. D) They're found in clusters of galaxies.