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a) A transformer draws 28 W of power from a 220 V power line, stepping the voltage down to 8 V. What will be the equivalent resistance of the input circuit?
b) The magnetic field in the region between the poles of an electromagnet is uniform at any time, but is increasing at the rate of 0.060 T/s. The area of the conduction loop in the field is 120 cm^2, and the total circuit resistance, including the meter, is 6.0 ohms. What is the magnitude of the induced emf?
c) A coil with 500 turns enclosing an area of 10 cm^2 is rotated from a position where its planes is perpendicular to earth's magnetic field to one where its plane is parallel to the field. The rotation takes 0.050 s. What is the average emf induced in the coil?
How much work was done by the lift on the automobile.
Your telescope has an objective lens with a focal length of 0.80m . You point the telescope at the moon, What is the angular magnification of the moon
An artillery shell is fired with an initial velocity of 300 m/s at 47.5° above the horizontal. To clear an avalanche, it explodes on a mountainside 47 s after firing. What is the x and y components of the shell where it explodes, relative to its f..
The heart requires a continuous flow of blood maintain normal function. The average length of the mid left anterior descending coronary artery is 11 cm, Calculate the decrease in pressure along this artery
You may also assume that v_0 gg sqrt{2gL}, so that the change in hammer's gravitational potential energy, as it drives the nail into the block, is insignificant.
A deuteron (the nucleus of an isotope of hydrogen) has a mass of 3.34×10?27kg and a charge of 1.60×10?19C, Find the speed of the deuteron
Assume the square wire loop is replaced with a smaller one, made of the same wire that is 0.02 m on a side, half as long as the original.
The first-order principal maximum produced by a grating is located at an angle of ? = 15.0 degrees. What is the angle for the third-order maximum
How much power is needed to push a 85kg chest at 0.72m/s along a horizontal floor where the coefficient of friction is 0.76
Find out the magnitude and direction of forces
A 69N box of clothes is pulled 8.9 m up a 30° ramp by a force of 100 N that points along the ramp. If the coefficient of kinetic friction between the box and ramp is 0.22, compute the change in the box's kinetic energy.
Two resistanceless rails 32 cm apart rest on a 6.0° ramp. They are joined at the bottom by a 0.63 resistor, What is the terminal (steady) velocity of the bar as it slides frictionlessly down the rails
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