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A common flashlight bulb is rated at 0.300 A and 2.70 V (the values of the current and voltage under operating conditions). If the resistance of the bulb filament at room temperature (20°C) is 1.90 Ω, what is the temperature of the filament when the bulb is on? The filament is made of tungsten.
a what is the strength of the electric field 4.0 cm from a small glass bead that has been charged to 8.0 nc?b what is
After flying for 15 minute in a wind blowing 42 km/h at an angle of 34 degree south of east, Find the speed of the airplane relative to the air
In Rutherfords famous scattering experiments thats led to the planetary model of the atom, How close does the alpha particle get to the gold nucleus before turning around
Besides the gravitational force, a 3.05-kg object is subjected to one other constant force. Determine the other force
A lens with a refrective index of 1.5 is coated with a material of refractive index of 1.2 in order to minimize the reflection. what is the thinnest possible coating
A block of weight 4.5 N is at rest on a horizontal table. An upward vertical force of 2.2 N is applied to the block by means of a string. What is the magnitude of the force exerted by the block
His arm is 70 cm long and has a mass of 4.0 kg. Illustrate what is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor?
a man can throw a ball a maximum horizontal distance of 142 m. the acceleration of gravity is 9.8 ms2 . how far can he
The index of refraction for red light in water is 1.331 and that for blue light is 1.340. A ray of white light enters the water at an angle of incidence of 80.4°. What is the underwater angle of refraction for the red component of the light?
A step-down transformer (turns ratio = 1:6) is used with an electric train to reduce the voltage from the wall receptacle to a value needed to operate the train. What is the current in the primary coil
A current with sinusoidal time-dependence, whose peak value is 5.55 A and frequency is 775 cycles per second, Calculate the average power dissipated by the loop, if its resistance is 64.3
a patient has a far point of 39.5 cm and a near point of 21.4 cm.a. what power in diopters should be prescribed to
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