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Let's say you take an ordinary wire coat hanger and straighten out the hook shaped part that normally hangs over the coat rack. Now, you can spin the (roughly) triangular part around by twisting the straightened part between your fingers. Estimate the EMF that you can generate by spinning the hanger in the Earth's magnetic field (about 5 x 10-5 T).
A contact lens is made of plastic with an index of refractionof 1.60. The lens has a focal length of +23.0 cm, What is the radius of curvature of the outer surface
In a certain region of space, the electric potential is given by V= 6y. The potential V is given in volts, the coodinate y is given in meters. Find the direction of the electric field
Two metal spheres are separated by a distance of 0.8 cm and a power supply maintains a constant potential difference of 850 V, what is the distance between the spheres at this time in nm
A centrifuge in a medical laboratory rotates at an angularspeed of 3600 rev/min. Find the constant angular accleration of the centrifuge
a child makes a ramp to push his toy dump truck up to his sand box.If he uses 5 newtons of force to push his 12 newton truck up the ramp
Determine the total impedance, phase angle, and rms current in an LRC circuit connected to a 9.0 kHz, 800 V (rms) source if L = 32.0 mH, R = 9.70 k, and C = 5000 pF? Impedance= 9.71 kilo ohms phase angle= ? degrees rms current = 82.3893 mA Can someon..
A photon is emitted when a hydrogen atom undergoes a transitionfrom the n = 5 state to the n = 3 state. Calculate the energy (in electron volts) of the emitted photon
A spherical metallic Christmas tree ornament has a diameter of 6.41 cm. If Saint Nicholas is by the fireplace, 1.37 m away, where will he see his reflection in the ornament
A 12 kg runaway grocery cart runs into a spring with spring constant 300 N/m and compresses it by 70 cm.What was the speed of the cart just before it hit spring.
Consider a piece of nichrome wire which is attached to a 1.2-mm-diameter aluminum wire, as diagrammed in the figure below. What diameter should the nichrome wire in the figure below be in order for the electric field strength to be the same in..
A pair of narrow slits are .075 mm apart and are located 1.5 m from the screen. Find the wavelength of the beam
The ball has a mass of 30 kg and a speed v=4m/s at the instant it is at its lowest point, 0 degrees.. Determine the tension in the cord at the instant = 25. Neglect the size of the ball. Determine the rate at which the ball's speed is decreasing at t..
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