In the brain, a typical frequency for an alpha wave is ______ Hz and for a delta wave is ______ Hz

a. 2, 4
c. 12, 4
b. 3, 12
d. 10, 14

C

Physics & Space Science

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Mortimer pushes against a wall with a force of 10 newtons for a time of 5 seconds. How much work does Mortimer do on the wall?

A) none B) 5 J C) 50 J D) 2 J E) 10 J

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The following three appliances are connected in parallel across an ideal 120-V dc power source: 1200-W toaster, 650-W coffee pot, and 600-W microwave. If all were operated at the same time what total current would they draw from the source?

A) 5.0 A B) 4.0 A C) 20 A D) 10 A

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When relating the linear momentum and total energy of an object with speed v = 0.8c, which of the following changes would increase the energy by the greatest amount? Assume that it is possible to change the mass of the object

A. increase the momentum of the object to 2p while keeping the mass constant. B. increase the mass of the object to 2m while keeping the momentum constant. C. imagine the speed of light to change to 82% of its present value (the object is still at initial speed v). D. increase the momentum of the object to 2p while keeping the velocity constant. E. increase the speed of the object to 0.95c.

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Suppose that we double the electrical power flowing into the filament of an incandescent bulb. By what factor will the most probable photon energy ? p increase?

A. 2 1/4 B. 21/3 C. 21/2 D. 2 E. 4 F. 8 T. 16

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Physics & Space Science