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A firefighter a distance d from a burning building directs a stream of water from a fire hose at angle ?i above the horizontal as in the figure in problem 14. If the initial speed of the stream is vi, at what height h does the water strike the building? (Use any variable or symbol stated above along with the following as necessary: g.)
An open-pit coal mine consumes 96 hectares of land, down to the depth of 26 m, each year. What volume of earth, in cubic kilometres, is removed in this time.
A blackened, solid copper sphere that has a radius equal to 4.5 cm hangs in an evacuated enclosure whose walls have a temperature of 23°C. find the initial rate at which its temperature changes
A cube of ice is taken from the freezer at -7.2 ?C and placed in a 115g aluminum calorimeter filled with 318g of water at room temperature of 20.0 ? C. What was the mass of the ice cube
A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 33.0 m above sea level, To what height above sea level does the rock rise
Identical conducting spheres
A projectile is launched straight up at 141m/s. How fast is it moving at the top of its trajectory? Presume it is launched upward at 45 degrees above the horizontal plane. How fast is it moving at the top of its curved trajectory.
A daredevil on a motorcycle leaves the end of a ramp with a speed of 39.0 m/s. what is the maximum height that he reaches
A ray of light is incident on a flat surface of a block of cubic zirconia that is surrounded by water. obtain the angle of reflection
A light spring-gun projectile launcher is mounted on an .443 kg air track glider. find the speed of the air-track glider after the gun is fired
What is the frequency of a spring with spring constant 420 N/m that has attached a mass of 3.5 kg and initially displaced 0.25 meters. what is the maximum kinetic energy this mass obtains
A power line 50km long has a total resistance of 0.60ohm, What percentage of the original energy is lost when the transformer is not used
A cyclist uses 27,000 joules per minute (this is about 385 food Calories per hour) to cycle at a constant pedaling rate of 450 radians per minute along a flat road using a gear ratio of 4
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