A piano wire has a radius of 0.500 mm. One end is fixed and the other is wrapped around a tuning peg that has a diameter of 3.00 mm and is 70.0 cm away. After the wire just becomes taut, the peg is given one and a half turns
What is the fundamental frequency of oscillation of the wire? The density of steel is 7860 kg/m3 and Young's modulus for steel is 20 × 1010 N/m2. A) 1020 Hz
B) 512 Hz
C) 2050 Hz
D) 342 Hz
E) 256 Hz
B
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The free-fall contraction of a molecular cloud
a. can be initiated by shock waves from supernovae. b. can be initiated by nearby spectral type G stars. c. can be initiated by the rotation of the cloud. d. causes the cloud to become transparent to ultraviolet radiation. e. causes the particles in the cloud to decrease the speed with which they move.
Specific Heat: In a flask, 114.0 g of water is heated using 67.0 W of power, with perfect efficiency. How long will it take to raise the temperature of the water from 15°C to 25°C? The specific heat of water is 4186 J/kg ? K.
A. 71 s B. 4.1 s C. 17 s D. 320,000 s
Comparison of the number of sunspots and the surface temperature of Earth shows a correspondence right up to the present day.
Answer the following statement true (T) or false (F)
A component in an automobile 12-V electrical system has a resistance of 20 ?
a. How much current is in the component when the system is in operation? b. How much energy is dissipated by the component each second?