A piano wire of length 1.5 m vibrates so that one-half wavelength is contained on the string. If the frequency of vibration is 65 Hz, the amplitude of vibration is 3.0 mm, and the density is 15 g/m, how much energy is transmitted per second down the wire?
a. 21 W
b. 11 W
c. 5.4 W
d. 2.2 W
e. 1.1 W
d
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Angie says that an object is in equilibrium if the net torques about the center of mass is zero. Robbie says that an object is in equilibrium if the sum of external forces is zero. Which one, if either, is correct?
A. Both are correct: an object is in equilibrium if either condition holds. B. Neither is correct: both conditions must hold simultaneously. C. Neither is correct: the net external force and the net external torque about any axis must be zero. D. Neither is correct: an object is in equilibrium only if its velocity is zero in all coordinate systems. E. Both are correct: if the sum of the external forces is zero, the net torque about any axis is automatically zero, and vice versa.
Three resistors, 10 ?, 20 ?, and 30 ?, are wired in series and connected to a 120-V battery. How much current flows in the circuit?
Impulse: A steady horizontal force lasting for 2.1 s gives a 1.25 kg object an acceleration of 3.2 m/s2 on a frictionless table. What impulse does this force give to the object?
A. 26 kg ? m/s B. 11 kg ? m/s C. 8.4 kg ? m/s D. 2.6 kg ? m/s
All meteorites collected on Earth come from asteroids or comets
Indicate whether the statement is true or false