A sculptor strikes a piece of marble with a hammer. Find the speed of sound through the marble (in km/s). (The Young's modulus is 50 × 10^9 N/m2 and its density is 2.7 × 10^3 kg/m3.)
a. 5.1
b. 4.3
c. 3.5
d. 1.3
e. 1.8
b
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Buoyancy: A 50-cm3 block of wood is floating on water, and a 50-cm3 chunk of iron is totally submerged in the water. Which one has the greater buoyant force on it?
A. the wood B. the iron C. Both have the same buoyant force. D. It cannot be determined without knowing their densities.
Which of the following is fundamentally different from the others?
A) sound waves B) X-rays C) gamma rays D) light waves E) radio waves
A laser pulse of duration 25 ms has a total energy of 1.4 J. If the wavelength of this radiation is 567 nm, how many photons are emitted in one pulse? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 4.8 × 1019 B) 3.2 × 1017 C) 9.9 × 1019 D) 4.0 × 1018 E) 1.6 × 1017
Which of the following statements is true regarding latent heat transfer?
What will be an ideal response?