Two strings of identical mass and length are stretched with their ends fixed, but the tension in one string is 1.10 times greater than in the other. Waves on the string with the lower tension propagate at 35.2 m/s
The fundamental frequency of that string is 258 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency? A) 11.0 Hz
B) 9.00 Hz
C) 13.7 Hz
D) 12.6 Hz
E) 17.1 Hz
D
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If we had the most powerful optical microscope in the world stacked on top of the next most powerful optical microscope in the world, we would
1) probably see atoms, 2) probably be able to photograph atoms even if we couldn't see them, 3) still not be able to see an atom, because atoms are 4) invisible. 5) visible when illuminated with infrared light. 6) material particles which have mass and size. 7) smaller than the wavelengths of visible light.
A parachutist falling at constant velocity is in a state of
A) dynamic equilibrium. B) non-dynamic equilibrium. C) being in and out of dynamic equilibrium. D) none of the above
Suppose working outside on a hot day someone generate 450 J of heat each second. If this energy is compensated for by the evaporation of sweat, how much water would be lost in an hour? The latent heat of fusion for water is 334 kJ/kg and for vaporization is 2,200 kJ/kg
a. 4.85 liter c. 0.50 liter b. 0.74 liter d. 1.5 liter
In 1919, general relativity was tested by measuring the deflection of starlight by the Sun. What event made this measurement possible?
A) a total solar eclipse B) a rare alignment in which some stars were positioned almost perfectly behind the Sun as viewed from Earth C) the first international treaty in which astronomers from different nations all worked together D) Einstein's personal permission for the measurements to be carried out