A standing wave is oscillating at 690 Hz on a string, as shown in the figure. What is the speed of traveling waves on this string?

A) 280 m/s
B) 410 m/s
C) 210 m/s
D) 140 m/s


Answer: A

Physics & Space Science

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An 80 kg person walks up a flight of 3 m high stairs, then down the same flight of stairs to the person's original position. What is the change in the person's gravitational potential energy?

a. 0 J b. 240 J c. 480 J d. 2352 J e. 4704 J

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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.

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Describe the outflow channels and valley networks on Mars

What will be an ideal response?

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Photons play the role of exchange particles for the electromagnetic field in a manner similar to _______, which play this role for the strong interaction.

A. positrons B. quarks C. leptons D. gluons E. muons

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