A plucked guitar string produces a sound wave of frequency 440 Hz
(a) What is the wavelength of the sound wave (assume the speed of sound in air is 340 m/s)? (b) How much time elapses between the impacts of two adjacent compressions on your eardrum?
(a) 0.77 m (b) 2.3 × 10-3 s
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If the distance from Earth to the Moon were doubled, the gravitational force between them would increase by a factor of 22, or 4
Indicate whether the statement is true or false
Phase Angles: An series circuit consists of an ac voltage source, a resistor of resistance 810 ?, and an inductor. (There is no capacitance in the circuit.) The current amplitude is 0.40 A, and the phase angle between the source voltage and the current has magnitude 11°. (a) Does the source voltage lag or lead the current?(b) What is the voltage amplitude of the source?
What will be an ideal response?
Spheres of Charge: A spherical conductor of radius 2.0 mm carries a charge of 7.1 nC. What is the magnitude of the electrical field at 6.0 mm from the center of the sphere? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 25 × 106 N/C B. 89 × 106 N/C C. 1.8 × 106 N/C D. 780 × 106 N/C E. 0.89 × 106 N/C
A 590-kg rocket is at rest on the launch pad. What upward thrust force is needed to accelerate the rocket uniformly to an upward speed of 28 m/s in 3.3 s?
What will be an ideal response?