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A light bulb is connected to a 240-V wall socket. The current in the bulb depends on the time t according to the relation I = (2.828 A) sin[(596.6 Hz)t].
(a) What is the frequency of the alternating current?
Hz
(b) Determine the resistance of the bulb's filament?
?
(c) What is the average power delivered to the light bulb?
W
A thin film of polystyrene is used as an antireflective coating for fabulite, What is the minimum thickness of film required, Assume that the wavelength of the light in air is 510 nanometers
A 6 kg box is held at rest by two ropes that form a 30 degree angle with the vertical. and external for F acts vertically downward on the box.
Find out the tension in the two strings. string between m1 and m2 2 N string between m2 and the 3.00 kg mass
A loudspeaker of mass 22.0 {rm kg} is suspended a distance of h = 1.60 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.90 {rm m}.
A motorcycle has a constant speed of 21.0 m/s as it passes over the top of a hill whose radius of curvature is 132 m. The mass of the motorcycle and driver is 343 kg. Determine the magnitude of the normal force that acts on the cycle.
Give a definition of "laissez faire" economics. (An economic doctrine that opposes government regulation of or interference in commerce.) Explain why do you think this was the dominant political and legal view in the 1800s and early 1900s?
The safe slides with a constant speed if Clyde pushes from behind with 405 N of force while Bonnie pulls forward on a rope with 350 N of force. Illustrate what is the safe's coefficient of kinetic friction on the bank floor?
A particular heat engine has a useful power output of 4.90 kW and an efficiency of 27.0%. In each cycle, Find the time interval for each cycle
A physics book slides off a horizontal table top with a speed of 1.00m/s. It strikes the floor after a time of 0.390ss, Find the height of the table top above the floor
A 77 person stands on the uniform ladder 4.0 long, that weighs 100. The floor is rough; hence, it exerts both a normal force, and a frictional force, on the ladder. The wall, on the other hand, is frictionless; it exerts only the normal force.
What is the horizontal distance x to the base of the wall supporting the mirror of the near point on the floor that can be seen reflected in the mirror . What is the speed of the third fragment? Overlook effects due to gravity.
Two trains, each having a speed of 38 km/h, are headed at each other on the identical straight track. A bird that can fly 70 km/h flies off the front of one train while they are 68 km apart and heads directly for the other train. On reaching other tr..
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