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A 104 W lightbulb has a resistance of about 12 when cold (20°C) and 137 when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity a = 0.0060 (C°)-1.
A series RLC circuit with L = 15 mH, C = 3.1 F, and R = 4.7 is driven by a generator with a maximum emf of 120 V and a variable angular frequency 8700. Find out phase angle (in degrees).
consider an electrostatic generating machine that charges an isolated conducting sphere to 19.9 kv relative to a ground
A viscous liquid is flowing steadily through a pipe of diameter D. Suppose you replace it by 7 parallel pipes, what is the total rate of flow in the 7 pipes compared to the original flow rate
In an internal combustion engine, air at atmostpheric pressureand a temperature of about 20 degrees celcius is compressed in the cylinder by a piston to 1/9 of its original volume, Estimate the temperature of the compressed air
An airplane's speed across the ground can be affected by the wind. how is the speed of the plane across the ground below affected
A billiard ball moving at 5.80 m/s strikes a stationary ball of the same mass. find the struck ball's velocity after the collision
a hollow copper wire with an inner diameter of 1.1 mm and an outer diameter of 1.8 mm carries a current of 15 a. what
suppose a satellite is in a circular orbit 5.425 earth radii above the surface of the earth 6.425 earth radii from the
how much work is required to bring three protons initially infinitely far apart to a configuration where each proton is
When the string is pulled a distance of 40 cm in 2.50 s, the wheel turns though 5 revolutions. what is the average angular velocity of the wheel
The brake is released on a car of mass 500 kg at the top of ahill with height 150m. find the velocity of the car atthe bottom of the hill
A rifle with a barrel length of 61.0 cmfires a 10.0 g bulletwith a horizontal speed of 360 {\rm m/s}. How long does it take the bullet to come to rest
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