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The function of those little black transformers that clog your power strips is to step down line voltage to run small electronic gadgets. Suppose a fax machine uses an ideal transformer with a primary voltage of 120 V and 300 primary windings. If the secondary voltage is 12 V, find
a.) the number of turns on the secondary.
b.) if the fax machine at idle draws enough current to dissipate 6 W, find the current that must flow in the primary.
Louie Lemon rides on a Ferris wheel that takes 8.0 s to go once around; the radius of the wheel is 10.0 m. What is Louie's acceleration (magnitude and direction) when he reaches the lowest point of the ride
Two students on roller skates stand face-to-face, then push each other away. One student has a mass of 99 kg and the second student 68 kg. Find the ratio of the magnitude of the first student's velocity to the magnitude of the second student's veloc..
A conducting wire formed in the shape of a right triangle with base b = 38 cm and height h = 63 cm, What is the angular frequency of rotation
A beam having a flux of 10^10 particles per second per cm^2 is incident on a target. The differential cross section is d(sigma)/d(omega) = (b^2)(sin(theta))^2. What is the total cross section
A 0.7 kW heater is designed to operate at 210 V. Assume that its resistance is constant. What is the power dissipated in this resistor if it operates at 120 V
The equation of a transverse wave on a string is y = (2.0 mm) sin[(19 m-1)x - (625 s-1)t]. The tension in the string is 11 N. Find the linear density of this string
question 1. a small sphere with a charge of -0.571 c is placed in a uniform electric field of magnitude 1.20 x 106 nc
A(n) 0.179 kilogram baseball is thrown with a speed of 22.8 m/s. Determine the average force exerted by bat on the ball if the two are in contact for 0.00148 second
An ultracentrifuge having a diameter of 16.3 cm produces an extremely large acceleration of 4.41E+5 m/s2. What is the angular speed of the centrifuge
A spaceship of rest length 192 m races past a timing station at a speed of 0.780c. What is the length of the spaceship as measured by the timing station
A bed rests on two scales which are 2.0 meters apart. A person lies down on the bed with their feet over one scale which reads 320. N while the other scale reads 380. N. How far from the persons feet is the center of mass?
Steam is expanded from 12.5 MPa and 900 degrees Celsius to 0.30 MPa, 400 degrees Celsius in an adiabatic turbine. Determine the power output by this turbine
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