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It is estimated that in the United States (population 250 million) there is one electric clock per person, with each clock using energy at a rate of 3.5 W. Using this estimate, how much energy is consumed by all the electric clocks in the United States in a year?
A parachutist with a camera descends in free fall at a speed of 11 m/s. The parachutist releases the camera at an altitude of 100 m. How long does it take the camera to reach the ground
Imagine that a stove burner provides thermal energy at a rate of 4800 J/s. What is the minimum time that it would take to melt 1 qt (about 1300 g) of ice in a pan placed on that burner
The label on a candy bar says 440 Calories. Assuming a typical efficiency for energy use by the body, how high could she go
q1. an electric field of 254000 nc points due west at the certain spot. what are the magnitude and direction of the
What is the speed of a wave on a string that has a mass of 9.6 kg and a length of 7.2 m while a 7.0 kg mass is hanging from the end?
Light of wavelength 624 nm is incident perpendicularly on a soap film suspended in air. Assume the soap film has n = 1.33. What are the smallest two thicknesses of the film for which reflections from the film undergo fully constructive interference?
A current of 1.5 A is flowing through a resistance of 18Ω. What is the voltage difference across their resistance
Two thin-walled concentric sphere of radii 5.0 cm and 10 cm have a potential difference of 100 V between them. What is the charge carried by each sphere
An air-filled parallel-plate capacitor has plates of area 2.90 cm2 separated by 2.50 mm. The capacitor is connected to a 6.0-V battery. find the magnitude of the uniform electric field between the plates
a person's reaction time is generally not quick enough to allow the person to catch a dollar bill dropped between the fingers. If a typical reaction time in this case is 0.25 s
The polarizers are rotated, so that the second polarizer has a transmission of 43.6 degrees with respect to the first polarizer, find the intensity of the beam
When 200nm light is incident on the cathode of a photoelectric tube, the stopping potential is 4.2V. A) Find the velocity of the most energetic electron emitted from the cathode when the incident light on the cathode is 100nm. B) Find the cutoff wave..
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