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You are stranded on a deserted island. You have some wire, but no magnets. You decide to use the Earth's magnetic field, the only one available to you. The Earth's magnetic field at your location is 8.0 x 10-5 T. You will try to use this field for a generator by moving a coil of wire at the highest frequency you can, 30 rotations per minute by turning a crank handle. The maximum number of turns the coil can have is 2000, due to weight and resistance constraints.
What area must the coil have?
Assuming the coil is circular (or as circular as you can make it!), what is the maximum translational speed of a point on the coil as it rotates.
Do you think this device is feasible - discuss the engineering aspects of creating it.
Blue light (λ = 450 nm) shines on a diffraction grating that has 4000 lines/inch. Calculate the angle of the fourth-order image.
Two cars, A and B, travel in the same direction on a straight section of highway. A has a speed of 72.0 km/h, What is the speed of B relative to A
A vertical straight wire carrying an upward 24?Acurrent exerts an attractive force per unit length of 5.9×10?4N/m on a second parallel wire 7.5cm away
A 420g oscillator has a speed of 128.5cm/s when its displacement is 3.30cm and 59.5cm/s when its displacement is 5.40cm .what is the oscillator's maximum speed
A cylinder (I = MR^2/2) is rolling along the ground at 7m/s. It comes to a hill and starts going up. Assume no losses to friction, how high does it get before it stops.
A high-speed photograph of a club hitting a golf ball. The club was in contact with a ball, initially at rest, for about 0.0028s. If the ball has a mass of 55 g and leaves the head of the club with a speed of 1.8 102 ft/s, find out the average forc..
You're designing a highway so that the maximum centripetal acceleration on a curve is no more than 1.0 m/s^2. What is the minimum curvature radius to accommodate a 100 km/h maximum speed? Please show the answer and how you got it!
A cannon tilted upward at = 33 fires the cannonball with a speed of 99. At that instant, what is the component of the cannonball's velocity parallel to the ground.
A stunt man whose mass is 70 kg swings from the end of a 4.40-m long rope along the arc of a vertical circle. Assuming that he starts from rest as rope is horizontal, find out the tensions in the rope that are required to make him follow his circu..
If the electric field strength in air exceeds 3.0 ? 106 N/C, the air becomes a conductor, determine the maximum amount of charge that can be carried by a metal sphere4.9 m in radius
A loudspeaker emits energy at the rate of 53W, What is the intensity of sound 19m from the speaker
A small ball of mass 0.60 kg is attached to one end of a 1.15 m long massless rod, and the other end of the rod is hung from a pivot
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