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Many lamps have a switch that lets you choose three levels of brightness. The bulbs in this type of lamp have not one but two filaments inside, which are wired in parallel and have their own switches. One of the filaments is designed to give off more light than the other when connected to the average 120 V emf provided by a wall outlet. In the dimmest position, only the least bright filament is on. In the next position, only the brighter filament is on. In the brightest position, both filaments are on.Suppose one of the filaments consumes 51.0 watts andthe other consumes 70.0 watts. What is their equivalent resistance in the brightest position (when both are turned on)?
A force of 10N acts on two blocks on frictionless surface. the first block is 3kg, and the second block is 2kg. what is the acceleration of the system? what force does the 3kg block exert on the 2kg block? what force does the 2kg block exert on th..
A 3.9 kg block of copper at a temperature of 70oC is dropped into a bucket containing a mixture of ice and water whose total mass is 1.2 kg, How much ice was in the bucket before the copper block was placed in it
consider a point charge with a charge q located at the origin in an empty space. let the electric potential be zero at
In 1993 a giant 400-kg yo-yo with a radius of 1.5 m was dropped from a crane at height of 57 m, estimate its linear speed at the end of the fall
The current in a 100 watt lightbulb is 0.720A. The filament inside the bulb is 0.240mm in diameter. What is the electron current in the filament
Temperatures are often measured with electrical resistance thermometers. Suppose that the resistance of such a resistance thermometer is 152 when its temperature is 25.4 °C. What is the temperature of the liquid
A particle moves on the x axis under the influence of the force F = ?/x3. The initial position is x0, and the initial velocity is 0. [Data: mass = 1 kg; ? = 2 N m3; x0 = 3 m. ]
The frequency of a slightly damped harmonic oscillator is Fd=1000 Hz. The amplitude of this oscillator drops to 1/(e^10) after 25 cycles. What are the undamped and resonant frequncies of the oscillator
A 1.20-m-long metal bar is pulled to the right at a steady 5.9m/sperpendicular to a uniform, 0.790-T magnetic field. Calculate the magnitude of the emf induced in the circuit
Determine the magnitude of the force on an electron traveling 7.85×105m/s horizontally to the east in a vertically upward magnetic field of strength 0.44T
Find (a) the wavelength in the medium, (b) the optical path length, and (c) the phase difference after moving that distance, with respect to light travelling the same distance in a vacuum.
The rails are laid on a winter day when their temperature is 1.8°C. (a) How much space must be left between adjacent rails if they are just to touch on a summer day when their temperature is 32.2°C
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