Buoyancy: An object weighs 7.84 N when it is in air and 6.86 N when it is immersed in water of density 1000 kg/m3. What is the density of the object?

A. 6000 kg/m3
B. 7000 kg/m3
C. 8000 kg/m3
D. 9000 kg/m3

Answer: C

Physics & Space Science

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The disintegration energy for gamma decay of a nucleus is typically on the order of 10-100 keV and can even be on the order of MeV. Which of the following statements best describes why the energies are so much larger than from atoms?

a. Energy levels within the nucleus are spaced farther apart than atomic levels. b. The spins of the paired protons and neutrons within the nucleus are aligned within energy levels. c. The higher energies of the gamma rays are higher in probability of emission because they must tunnel through classically forbidden regions. d. All nuclei are only metastable, increasing binding energy exponentially when the nucleus is in an excited state. e. The Coulomb attraction within the nucleus places it lower in energy, therefore greater excitation energies are necessary.

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A __________ interacts via the strong interaction

Fill in the blank(s) with correct word

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The principle difference between a step-up and step-down transformer is

A) step-up transformers can handle more current. B) different geometries. C) different ratios of turns of wire for each. D) none of the above

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1300 rev/min is equivalent to which of the following?

a. 2600 rad/s c. 273 rad/s b. 136 rad/s d. 60 rad/s

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Physics & Space Science