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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?
The dial on an AM radio contains numbers ranging from about 530 to about 1600. What is the corresponding range of wavelengths
What are the magnitude and direction of the resultant vector R , when the parallelogram law is applied to A and B?
A 4kg pumpkin is sitting stationary on a platform. What is the total energy of the pumpkin measured by a person standing on the platform
How many kilocalories of heat are produced when the brakes are used to bring a 930 kg car to rest from a speed of 102 km/h.
Find out the magnitude and direction of the initial velocity.
A hydrogen atom in the ground state absorbs a 13.06eV photon. find the wavelength of the photon emitted in this quantum jump
You're burning calories by weight lifting. You lift a 65kg barbell and 1.8m and repeat 15 times. How much energy in Cal do you expend
A man strides across a bed of embers. Assume the glowing charcoal is covered with a thin layer of ash 0.50 mm thick and is at a temperature of 650C. The thermal conductiviity of ash and charcoal is 1.5 W/ (mxK). (a) Estimate the heat transferred t..
A Martian leaves Mars in a spaceship that is heading to Venus. On the way, the spaceship passes earth with a speed v = 0.86c relative to it. What is the time of the trip (in seconds) as measured by the Martian
A positive charge q1 = 2.50 µC on a frictionless horizontal surface is attached to a spring of force constant k, the distance between charges to d = 9.00 cm, Find the value of k
if you throw a ball upward with an initial speed of 4m/s at 1.5 above the ground, find the final velocity just before touching the ground
A 1500 kg elevator moves upward with constant spped through a veticle distance of 25m. Explain how much work was done by the tension in the elevator cable?
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