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A sodium vapor light emits 10 W of light energy. Its wavelength is 589 nm, and it spreads in all directions. How many photons pass through your pupil, diameter 4mm, in 1 s if you stand 10 m from the light?
A coil of 15 turns and radius 10.0 cm surrounds a long solenoid of radius 2.00 cm and 1000 turns/meter. The current in the solenoid changes as I = (5.00 A) sin(120t). Find the induced emf in the 15-turn coil as a function of time.
Air that initially occupies 0.47 m3 at a gauge pressure of 100 kPa is expanded isothermally to a pressure of 101.3 kPa, Compute the work done by the air
two wires are kept tight between the same pair of supports. the tensions in the wires are in the ratio 41 the radii are
A concrete highway is built of slabs 8.0 m long (20°C). How wide should expansion cracks between the slabs be (at 20°C) to prevent buckling if the range of temperature is -35°C to +45°C.
A ball is thrown vertically upward with a speed of 12.0 m/s. How long does it take to reach its highest point
Knowing the temperature at the surface of the Earth to be 72 Find the temperature at the surface of Venus
A uniform electric field (thatis, ~E is the same at every point) exists in a region between oppositely charged plates. An electron is released from rest at the surface of the negatively charged plate and strikes the surface ofthe opposite plate, 2..
A 3 kg box is pushed across a frictionless horizontal floor with a force F = 20 N that makes an angle of 25° with the horizontal. The box moves 18 m.
determine the largest angle MAX that the crutch can have just before it begins to slip on the floor.
Jack and John are standing 6m apart from each other playing soccer. Jack kicks the ball to John and John kicks it back immediately. find the speed of the ball when it's kicked back to Jack
A vertical container with base area measuring 16 cm by 18 cm is being filled with identical pieces of candy, each with a volume of 50 mm3 and a mass of 0.020g. Suppose that the volume of the empty spaces between candies is negligible.
A 5 turn loop of wire with a radius of 4cm moves toward a 0.15T magnetic field in a 3 second time interval. What is the average emf induced in the loop? If the loop has a resistance of 5 ohm, what current is generated?
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