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How large an inductance, in henrys (H), should be connected in series with a 120 V, 60 W lightbulb if it is to operate normally when the combination is connected across a 240 V, 60 Hz line? (First determine the inductive reactance required. You may neglect the resistance of the inductor and the inductance of the lightbulb.)
An airplane can be made invisible to radar by coating the plane with a thin layer of an antireflective material. How many dark fringes are observed when 600 nm light illuminates the slides from directly above
A 0.527 kg metal cylinder is placed inside the top of a plastic tube, the lower end of which is sealed off by an adjustable plunger, what is the initial acceleration of the metal cylinder
After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 51.0cm. find the magnitude of the gravitational acceleration on this planet
How much work (in joules) is done in moving a charge of 2*10^-6 electrons from positive terminal of the battery to the negative terminal of a 12-Volt battery.
A 0.88 kg projectile is fired into the air from the top of a 7.07 m cliff above a valley, How far from the bottom of the cliff does the projectile land and Find the time of flight
A 131 kg sign hangs between two buildings by two cables. Cable 1 is attached at a 36 degree angle wrt to the horizontal, and Cable 2 is attached at a 24 degree angle wrt to the horizontal. What is the tension in cable 1.
How much energy must be added to a bowl of 125 popcorn kernels in order for them to reach a popping temperature of 175celsious? assume that their initial temperature is 21 celsious, that specific heat capacity of popcorn is 1650 j/kgcelsious, and ..
A specimen of oil having an initial volume of 620 cm^3 is subjected to a pressure increase of 3.6 MPa, What is the compressibility of the material
Trin has been prescribed bi-focals because his near point is at 2 m instead of 25 cm and his far point is at 10 m instead of infinity. Describe what's wrong with his eyes
A capacitor has parallel plates of area 12cm^2separated by 2.5 mm. The space between the plates is filled with polystyrene (K=2.6,Em=2.0*10^7 V/m). Find the permittivity of polystyrene
train engine has a mass of 2.1 x 107 and is moving acrossed a bridge at 23.9 miles per hour what is the kinetic
A student m = 81 kg runs at a velocity vi = 2.25 m/s before jumping on a skateboard. After jumping on the board the student has a velocity vf = 1.75 m/s. What is the mass of the skateboard in kg
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