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A train whistle has a certain acoustic power. If the sound energy from the whistle spreads out spherically, and the intensity level is measured to be 90 Db at a distance of 200 meter from the train, determine what is the power of the whistle?
Charges of 6.0 uC are placed at corners of a square that has sides of 2.0cm. Find the magnitude and direction of the force on the charges
Four identical metallic objects carry the following charges: +5.4 µC, +5.4 µC, -7.0 µC, and -1.6 µC. What is the final charge on each object
A flat uniform circular disk (radius = 4.91 meter, mass = 400 kilogram) is initially stationary. Obtain the resulting angular speed of the disk
A soccer ball of mass 400g is rolling at a speed of 8m/s along a flat horizontal surface. Find the rotational kinetic energy of the ball
Two long, parallel wires carry currents of 0.245 A in the same direction. If the wires are 0.034 m apart, what is the force per unit length between the wires
q1. a gun shoots bullets that leave the muzzle with a speed of 326 ms. if a bullet is to hit a target 172 m away at the
a) What power contact lens should an optometrist prescribe to move the myopic far point out to infinity. b) with this correction, can Brian also read a book held at the normal near point, 25 cm from his eye.
question a radiation detector indicates the decay activity of a radioactive material. which would have a higher reading
The primary winding of a transformer has 1200 turns, and is connected to 120 V A.C. (r.m.s. value). The secondary has a 25 W load resistor, Continuing, how many turns are in the secondary winding
A ball of mass 6.2 kg and radius 8 cm rolls without slipping horizontally at 4.8 m/s and hits a spring attached to a wall. What is the maximum change in length of the spring
If a washing machine drum has a radius of 27 cm and spins at a rate of 3.9 revs per second, what is the strength of the artificial gravity that the clothes are subjected to? Express answer as amultiple of G. Please work out this question using "ma..
An object is moving in a circular path of radius 4.00 m. If the object moves through an angle of 30.0 degrees, then what is the tangential distance traveled by the object
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