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A 100 W lightbulb produces 4.0 W of visible light. (a) What is the light intensity on a wall 3.0 m away from the lightbulb? (b) Where did the 96 W go? (c) A krypton laser produces a cylindrical red laser beam 3.0 mm in diameter with 4.0 W of power. What is the light intensity on a wall 5.0 m away from the laser?
A 1500 car travelling at 26 suddenly runs out of gas while approaching the valley that looks like an inverted hump. 12m at the left where the care runs out of gas and 19 m at the right were it is headed. What will be the car's speed as it coasts into..
The isotope 12N undergoes radioactive decay to form 12C. What charged particle is emitted in the decay process
A wrecking ball (weight = 4800 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3600 N. As support cable runs from the top of the boom to the tractor.
What is the average kinetic energy of an ideal gas.
A second baseman tosses the ball to the first baseman, who catches it at the same level from which it was thrown, What is the y component of the ball's velocity
A 94 cm is pulled aside a small distance and released. After 120 oscillations the amplitude is one-half of its starting value. What is the value of the damping coefficient
Two current-carrying wires are exactly parallel to one another and both carry 3.5 A of current, What is the direction of the magnetic force caused by wire 2 on wire 1
A spider of mass m is sitting in a perfectly symmetric web (in a vertical plane with 45 angles between the web lines), where Ti's denote the tensions along the lines that are connected to the spider at the center with i = 1, 2, 3, 4, 5, 6, 7, 8. The ..
During a game of football, the ball is kicked by the punter with a speed of 20m/s at an angle of 40 degrees above the horizontal. A player on the other team, standing 50m away, starts running to catch the ball immediately after it is kicked. ASsu..
A 100.0 m long rod with a diameter of 3.0 mm has a charge of 1032 C. What is the approximate electric field 3 mm from the surface of the rod
The wingspan (tip-to-tip) of a Boeing 747 jetliner is 59 m. The plane is flying horizontally at a speed of 300 m/s. Find the emf induced between the wing tips
A lens forms an erect image of a real object. The image is twice the size of the object and appears to be 40 cm from the lens
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