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A person wears a hearing aid that uniformly increases the sound level of all audible frequencies of sound by 27.8 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 2.90 10-11 W/m2. What is the intensity delivered to the eardrum.
A mass hangs on the end of a massless rope. The pendulum is held horizontal and released from rest. When the mass reaches the bottom of its path it is moving at a speed v = 2.4 m/s and the tension in the rope is T = 14.9 N. How long is the rope
The right-side rearview mirror of Mike's car says that objects in the mirror are closer than they appear. Mike decides to do an experiment to determine the focal length of this mirror. What is the focal length of the rearview mirror
Three long parallel wires are at the corners of a square of side 5.0 cm and each carry a current in the same direction of 93.0 A. What is the magnitude of the magnetic field at the corner where there is no wire
A passenger walks from one side of a ferry to the other as it approaches a dock. What is the direction of the ferry's velocity relative to the water
Sirius has a luminosity of 8.4 * 10^27 Watts and a mass of 2.1 times the mass of the Sun, How much hydrogen does Sirius convert into helium each second
question1a sealed well-insulated 2000ml thermos bottle with negligible heat capability is completely empties - a
You push on the chair with a force of = 37.0 directed at an angle of 43.0 below the horizontal and the chair slides along the floor. Using Newton's laws, compute the magnitude of the normal force that the floor exerts on the chair.
A gasoline engine fuel burns at a temp of 500 degrees Celsius. Its radiator cools to 70 degrees celsius. What is the engines Carnot efficiency
A 2.30-kg object attached to a spring moves without friction (b = 0) and is driven by an external force given by the expression F = 3.50sin(2(3.14)t), Find the angular frequency of the driven system
A wave on a string has an amplitude of 0.32 m, a frequency of 120 Hz, and a wavelength of 1.4 meters. What is the maximum speed of a point of the string
What is the minimum uncertainty in position, in nm, of an electron whose velocity is known to be between 2.30×105m/s
Compute the linear momentum and angulat momentum of a Frisbee of mass 0.16 kg. if it has a linear speed 0f 2.0 m/s and an angular velocity of 50 rad/s
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