The Sun, at absolute magnitude +4.8, would be one of the brightest stars in the sky if seen from 32 light-years distance
Indicate whether the statement is true or false
FALSE
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When a spinning ice skater pulls in his arms, he spins faster because
A) his angular momentum must be conserved, so reducing his radius must increase his speed of rotation. B) there is less friction with the air. C) there is less friction with the ice. D) there exists an unbalanced reaction force.
As a spaceship's velocity gets closer to the speed of light
A) its length will increase and its clock will run more slowly. B) its length will decrease and its clock will run faster. C) its length will increase and its clock will run faster. D) its length will decrease and its clock will run more slowly. E) None of these will happen.
A 140-keV photon strikes an electron and scatters through an angle of 120° from its original direction
(melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) (a) What is the wavelength of the photon before scattering? (b) What is the photon wavelength after scattering?
The thermal conductivity of aluminum is 238 W / m •°C and of copper is 397 W / m •°C. A rod of each material is used as a heat conductor. If the rods have the same geometry and are used between the same temperature differences for the same time interval, what is the ratio of the heat transferred by the aluminum to the heat transferred by the copper?
a. 0.599 c. 0.359 b. 1.67 d. 2.78