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A person with a remote montain cabin plansto install her own hydroelectric plant. A nearby stream is 3.00mwide and 0.500m deep. Water floes at 1.20m/s over the brink of awaterfall 5.00m high. The manufacturer promises only 25.0%efficiency in converting the PE of the water-Earth system intoelectric energy. Find the power she can generate.
A thermos contains 170 cm3 of coffee at 85° C. To cool the coffee, you drop two 14-g ice cubes into the thermos. What is the final temperature of the coffee
the light intensity incident on a metallic surface with a work function of 1.17eV produces photoelectrons with maximum kinetic energy of 4.17eV. what is the maximum kinetic energy of the photoelectrons
A 1070-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A 1960-N crate hangs from the far end of the beam.
There is a a bright 10,000 W light bulb shining in all directions that is in the middle of a large room. What is the mass of the sheet
You swing a 2.80 stone in a circle, using the full length of a thin 60.0 rope. At what speed should you swing it so its acceleration will be 9.8
The heaviest and lightest strings on a certain violin have linear densities of 3.0 and 0.29 g/m. What is the ratio of the diameter of the heaviest string to that of the lightest string, assuming that the strings are of the same material?
A 38.0-kg child swings in a swing supported by two chains, each 3.08 m long. The tension in each chain at the lowest point is 426 N. Find the force exerted by the seat on the child at the lowest point
Two spheres of mass m and a third sphere of mass M form an equilateral triangle, and a fourth sphere of mass mB is at center of the triangle.
A 5.00 mL syringe has an inner diameter of 6.00 mm, a needle inner diameter of 0.210 mm, and a plunger pad diameter (where you place your finger) of 1.2 cm. A nurse uses the syringe to inject medicine into a patient whose blood pressure is 140/100..
An archer's bow is drawn at its midpoint until the tension inthe string is 1.20 times the force exerted by the archer. What is the angle between the two halves of the string
Light inside an optical fiber tube hits the wall between the tube and air and is totally internally reflected. what is the index of refraction of the tube
A 125-turn circular coil of radius 2.75 cm is immersed in a uniform magnetic field that is perpendicular to the plane of the coil. Find the magnitude of the average EMF
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