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Suppose that the sound level of a conversation is initially at an angry 70 dB and then drops to a soothing 50 dB. Assuming that the frequency of the sound is 500 Hz, determine the
(a) initial and
(b) final sound wave amplitudes.
The tires of a car make 51 revolutions as the car reduces its speed uniformly from 95km/h to 38km/h. What was the angular acceleration of the tires
A ball of mass 0.40 kg is fired with velocity 140 m/s into the barrel of a spring gun of mass 2.1 kg initially at rest on a frictionless surface. What fraction of the ball's initial kinetic energy is stored in the spring
Jack was exposed to fast neutrons; he received a radiation dose of 220rem rem on part of his hand, affecting 28.0grams of tissue. How much radiation did Jack receive
Calculate the number of bright fringes per centimeter. At what two locations on x-axis (xpositive, xnegative) is the potential zero.
Two masses are connected by a cord passing over a pulley of radius R and moment of inertia I. Mass A slides on a frictionless surface, Derive a formula for the acceleration of the masses
What is an average speed
The dialectric breakdown of air is approximately 3E6 V/m. This is the electric filed required to create a spark, What is the approximate voltage on the sphere at that instant
A 95-{rm m}-long train begins uniform acceleration from rest. The front of the train has a speed of 25 {rm m/s} when it passes a railway worker who is standing 120m from where the front of the train started. What would be the speed of last car as ..
When a guitar string is sounded along with a 440 Hz tuning fork, a beat frequency of 4 Hz is heard. compute the frequency of the string
Polarized light goes through two Polaroid sheets. The angle between the two sheets is 50°. what is the angle between the original light and the first sheet
A small block with mass 1 kg slides in a vertical circle of radius 0.5 m on the inside of a circular track. how much work is done by the friction force on the block
Two narrow slits 50 micrometers apart are illuminated with light of wavelength 500 nm . What is an angle of the m=2 bright fringe in radians? in degrees.
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