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There are approximately 109 million TVs in the United States. Each uses, on average, 74 W of power and is turned on for 6.6 hours a day. If electrical energy costs 0.085 dollars per kWh, how much money is spent every day in keeping the TVs turned on?
a grindstone has a radius of 6.00 cm and rotates at 7000 rpm. What is the linear speed of a point on its edge
when the wavelength of an incident radiation exceeds 560nm the emission of photoelectrons from a surface ceases. what
A 9.40 10-3 kg bullet is fired horizontally into a 2.64-kg wooden block attached to one end of a massless, horizontal spring (k = 853 N/m). What is the speed of the bullet
When a quarterback throws a quick pass, he pushes on the ball with constant horizontal force for 0.10 sec, while his hand moves forward 0.80 m. find the work done on the ball by the quarter back
In a capacitor, one side accumulates charge because the battery is putting charges on it. Explain how the other plate becomes charged. In addition, explain why, as a plate accumulates charge, it becomes harder and harder to put more charges onit.
you will explain in detail the principles and laws of electrodynamics under which maglevtrains operate. you will
While looking at her image in a cosmetic mirror, Dina notes that her face is highly magnified when she is close to the mirror, but as she backs away from the mirror, her image first becomes blurry, then disappears when she is about 24.0 cm from th..
Suppose that the specific heat capacity cp Of the body discussed in Section 7.6 of the text is 10 J kg-1 K-1and T1 =200 K. Find the entropy change of the universe in both cases
Electrons are injected into a chamber with a B field of 10T at a velocity of 10^7 m/s, the electrons will go into cyclotron orbit. What is the direction of the orbit
The Zo boson, discovered in 1985, is the mediator of theweak nuclear force, and it typically decays very quickly. What is the lifetime of this particle
What are (a) the energy, (b) the momentum, and (c) the wavelength of the photon that is emitted when a hydrogen atom undergoes a transition from the state n = 3 to n = 1?
You hit a golf ball at a 61 degree angle, and it lands 120 m away, and 9 m down in a hole from it's original Y position. Find initial velocity and the maximum height
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