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Perhaps it has occurred to you that we could tap Earth's magnetic field as a source of electrical potential from which we could then generate energy. One way to do this would be to spin a metal loop about an axis perpendicular to Earth's magnetic field. Suppose that the metal loop is a square that is 45.0 cm on each side and that we want to generate a potential in the loop of amplitude 125 V at a place where Earth's magnetic field is 0.50 x 10-4 T. At what angular speed (in rev/s) would we have to spin the coil?
A 40 kg girl and an 8.4 kg sled are on the fictionless ice ofa frozen lake, 15m apart but connected by a rope of negligiblemass. How far from the girl's initial position do they meet
a fresnel zone plate is prepared with a drawing program and printed on a laser printer. the printed zone plate has a
a positive charge of q1 is located 7.00 m to the left of a negative charge -q2. the charges have different magnitudes.
The cost of electricity varies widely throughout the United States; $0.120/kWh is a typical value. At this unit price, compute the cost of the following. Leaving a 40.0-W porch light on for two weeks while you are on vacation.
the yellow light from a helium discharge tube has a wavelength of 587.5nm. when this light illuminates a certain
An automobile has a vertical antenna 1.30 m long. The automobile travels eastward at 65 km/h on a horizontal road, Calculate the maximum magnitude of the induced emf in the antenna
An inclined plane of angle ? has a spring of force constant k fastened securely at the bottom so that the spring is parallel to the surface. A block of mass m is placed on the plane at a distance d from the spring.
To save fuel, some truck drivers try to maintain a constant speed when possible. A truck traveling at 103.0 km/hr approaches a car stopped at the red light. When the truck is 136.5 meters from the car the light turns green and the car immediately ..
You are to build a box whose height is 0.280 times its length. In order for the box to have a given volume while using a minimum amount of cardboard, what should be the ratio of the width of the box to its length.
Find the flux of Earth's magnetic field of magnitude 5.00 x10-5 T through a square loop of area 30.0 cm2 for the following: when the field is perpendicular to theplane of the loop. when the field makes a 40.0°angle with the normal to the plane of the..
When are the displacement, velocity, and acceleration equal to zero for the motion of a mass on a spring? A. at maximum displacement B. at minimum displacement C. at the equilibrium position D. at a displacement of 2x E.at a displacement of 1/3x.
a fly beats its wings at a frequency of 1200 Hz. if the expansion and contraction of the wing muscles of the fly exhibits simple harmonic motion, what is the time period of a single beat of the flys wings
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