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A certain source of sound radiates uniformly in all directions in air. At a distance of 5m the sound level is 80 dB. The frequency is 440 Hz.
(a) What is the displacement amplitude at this distance?
(b) What is the pressure amplitude?
(c) At what distance is the sound level 60 dB?
A chemist must dilute of M aqueous silver nitrate solution until the concentration falls to M . He'll do this by adding distilled water to the solution until it reaches a certain final volume
A solenoid 26 cm long has 2800 turns of wire and carries a current of 5.9 A. Find the magnetic field at the common center
Two balls are approaching each other head-on. Their velocities are +14.6 and -8.88 m/s. Determine the velocity of the center of mass of the two balls
A soccer player kicks a ball toward a wall 15.0 m away, with velocity 25.0 m/s at 30.0 above the horizontal. Determine how high up the opposite wall the ball hits, and nd the impact velocity
Suppose a 1.83-g nugget of pure gold has zero net charge. What would be its net charge after it has 1.92 % of its electrons removed?
Two capacitors with C1 = 600 pF and C2 = 780 pF are connected in parallel. What is the reactance of the equivalent capacitance at33 kHz
An insect sits on the edge of a spinning record that has a radius of 0.15 m. The insect%u2019s speed is 0.6 m/s. What is the insect's acceleration
A certain speed boat weighs 5,880 N. It can accelerate from 0 to 40 m/s in 5 seconds. (Need to see the math). How large is the net force acting on the boat
A cannon fires a cannon ball at 769.26 m/s in a straight line that passes directly over an observer's head. how far is the cannon from the observer
find the mass of Earth from the period T and the radius r of the Moon's orbit about the Earth. T=27.3 days and r=3.82E5 km. suppose the Moon orbits the center of Earth rather than the center of mass of the Earth-Moon system.
A 3kg model rocket initially at rest experiences an average force of 3950N over a distance of 200 cm. How much has the rockets kinetic energy increased
A metal sphere has a charge of +6.9uc. What is the net charge after 7.6x10^13 electrons have been placed on it
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