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A screen is placed among two lamps so that they illuminate the screen equally. The first lamp emits a luminous flux of 1445 lm and is 2.5 m from the screen. What is the distance of the second lamp from the screen if the luminous flux is 2375 lm?
A group of hikers hears an echo 3 s after shouting. If temperature is 16°C, how far away is the mountain that reflected sound wave.
When light of wavelength 300 nm falls on a cobalt surface, electrons are emitted that have a maximum kinetic energy of 0.240eV. Compute The cut off wavelength, The work function of cobalt,
Earth's radius is 6384 km. How many rotations per day would earth have to spin such that a person standing on the equator would weigh nothing? what is the person's tangential speed
question suppose that a weight on a spring has an initial position of s0-5 inches and a period of p2 seconds. find a
a block is released from rest when the spring is stretched a distance d. if k 50 nm m 0.50 kg d 10 cm and the
particle a of charge 7.00 10-4 c is at the origin particle b of charge -8.00 10-4 c is at 6.00 m 0 and particle c of
An 87.6-mH inductor anda 6.37-µF capacitor areconnected in series with a generator whose frequencyis 391 Hz. The rms voltage across the capacitor is 2.26V. Determine the rms voltage across the inductor.
A model airplane with a mass of 0.747 kg is tethered with a wire so that it flies in a circle 29.6 m in radius. The airplane engine provides a net thrust of 0.803 N perpendiculars to the tethering wire. Discover the angular acceleration of the airpla..
An 8.00 point mass and a 15 point mass are held in place 50 apart. A particle of mass is released from a point between the two masses 13.00 from the 8 mass along the line connecting the two fixed masses.
A current of 7.95 A in a solenoid of length 12.4 cm creates a 0.301-T magnetic field at the center of the solenoid. How many turns does this solenoid contain
A Light-Dimmer Circuit The intensity of a lightbulb with a resistance of 140 Ohms is controlled by connecting it in series with an inductor whose inductance can be varied from L=0 to L=Lmax. What is the average power dissipated in the lightbulb whe..
ten megawatts of electricty is to be transmitted over a power line of resistance 4 ohms. At what current will the power be transmitted
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