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A high-intensity desk lamp is rated at 75 W, but its bulb requires only 9 V. The lamp contains a transformer that converts 110 V household electricity.
What is the current in the secondary winding of the transformer when the lamp is on?
What is the current in the primary winding when the lamp is on?
What is the resistance of the bulb when it is on?
Write the expression of the force fl j corresponding to the Uu potential energy term. Derive the expression of the distance r m i n at which Uu has its minimum value, as a function of the parameters a and/or E.
ten megawatts of electricty is to be transmitted over a power line of resistance 4 ohms. At what current will the power be transmitted
A 70.0 kg construction worker stands at the far end of the beam. What is the magnitude of the torque about the point where beam is bolted into place.
A spherical asteroid has a radius of 545 km and a surface g of 3.0 m/s2. What is the mass of the asteroid, What is the potential energy of a 1 kg object on the surface
An electron enters a region of constant electric field that is produced by a parallel-plate capaci- tor, find the velocity of the electron when it exits the capacitor
A man can row a boat at a speed of 7.45 km/h in still water. If he is crossing a river where the current is 2.00 km/h, find what direction should his boat be headed
q1. the force vector a has a magnitude of 84.0 newtons n and points due east. the force vector b has the magnitude of
A ball is thrown toward a cliff of height h with a speed of 31m/s and an angle of 60 degrees above horizontal. What was the maximum height of the ball
The mass of a bottom quark is 4.20Gev/c^2 and was found by colliding a beam of protons with a cloud of stationary protons. How fast were they moving
An electron that has an energy of approximately 2.0e+01 eV moves between rigid walls 1.8 nm apart. Find the precise energy of the electron
Consider two identical 25-micro-coulomb point charges, each of 18 mg mass. Let them initially be at rest, 80 cm apart. How fast (in m/s) will each charge be moving when the charges are very far apart
After the collision, the blue puck has a velocity of 2i – 2j m/s. Illustrate what is the velocity of the gold puck after the collision?
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