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A certain laser outputs pure blue light (photon energy 3.1 eV) with power 400 milliwatts (0.4watts). How many photons per second does this laser emit? The answer should be in photons/secs.
You have been instructed to calculate the amount of time it would take to drain 3/4 of a full, open tank in the shape of a octagon. Water flows from the tank at a rate (Q) that decreases with time.
Two steel wires of the same length, one with radius r and the other with radius 2r, are connected together, end to end, and tied to a wall. How far does the point where the two wires meet move
Consider a cloud that, when viewed from a point on the surface, occupies the portion of the sky defined by: pi/4
Find the focal length of a glass lens that has an index of refraction equal to 1.58, a concave surface that has a radius of curvature of magnitude 104 cm, and a convex surface
The engine of a large ship does 2.10 ? 108 J of work with an efficiency of 4.00%. How much waste heat is produced
An 80 kg skydiver falls through air with a density of 1.15 kg/m3 . Assume that his drag coefficient is C=0.57. What are the terminal speeds in both cases
A horse can maintain a top speed of 20m/s for a long distance but has a maximum acceleration of only 6.0m/s^2. how far does it run, to the nearest 10m
The only force acting on a particle is conservative force . If the particle is at point A, What is the potential energy of the system with the particle at B
a substance has a density of p=200kg/m3. what is the mass of the box full of substance?
A bullet of mass 0.025kg moves at 100m/s initially. It hits a 2kg block of soft pine and emerges from the block at 30m/s. How fast is the block of wood moving after the bullet emerged?
At rest, a car's horn sounds the note A (440 Hz). The horn is sounded while the car is moving down the street. A bicyclist moving in the same direction with one-third the car's speed hears a frequency of 417 Hz. Is the cyclist ahead of or behind th..
A tennis player hit a ball 2.0 m above the ground. The ballleaves his racquet with a speed of 20m/s and an angle of 5.0 degrees above the horizontal. The horizontal distance to the net is 7.0m and the net is 1.0 m high.
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