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A light bulb is connected to a 120 V wall socket. The current in the bulb depends on the time t according to the relation I = (1.414 A) sin[ (125.6 Hz) t ].
(a) What is the frequency of the alternating current?
Hz
(b) What is the resistance of the bulb's filament?
(c) What is the average power delivered to the light bulb?
W
A charge +q is located at the origin, while an identical charge is located on the x axis at x = +0.53 m. A third charge of +2q is located on the x axis at such a place that the net electrostatic force on the charge at the origin doubles, its direc..
A dentist uses a small mirror of radius 55 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 20 mm from the tooth, what is the magnification of image.
A 0.22-kg coffee mug is made from a material that has a specific heat capacity of 900 J/(kg · C°) and contains 0.23 kg of water. determine the minimum power rating of this heater
The parallel metal plate of a capacitor is seperated by a distance of 0.5cm and is connected to a 90v battery. Find an electric field between them and the surface charge density.
Block B in the figure weighs 760 N. The coefficient of static friction between block and table is 0.28; angle ? is 27°; Find the maximum weight of block A for which the system will be stationary
A weather emergency siren is mounted on a tower, 177 meters above the ground. On one hand, you would like to make the siren very loud so that it will warn as many people as possible. what is the maximum power that the siren can put out
The pulley system is used to lift a 61 kg crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. The crate is rising with an acceleration of 2.4 m/s2. Assume the masses of the ch..
Throughout three hours one winter afternoon, when outside temperature was 9° C, a house heated by electricity was kept at 21° C with the expenditure of 46kwh (kilowatt•hours) of electric energy.
Two objects of masses m and 3.00 m are moving towards each other along the x-axis with the same initial speed of v. The object with mass m is travelling to the left.
A bomb at rest at the origin of an xy-coordinate system explodes into three pieces. Just after the explosion, one piece, of mass m, what is the magnitude of the velocity of the third piece
A vertical spring with a spring constant of 480 N/m is mounted on the floor. From directly above the spring, that is unstrained, a 0.150 kg block is dropped from rest.
approximately what is the mass of an object whose weight equals the force from part "b"? can you lift such a mass.
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