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A fire house 4.0cm in diameter is capable of spraying water at a velocity of 10 m/s. For a continuous horizontal flow of water, what horizontal force should a fireman exert on the hose to keep it stationary?
Eratosthenes measured the circumference of the Earth by noting that the Sun is at an angle of 7°12' = 7.2° ("one-fiftieth of a circle") south of the vertical in Alexandria at the same time of day, What was Eratosthenes percent error
reneacute descartes is often called the father of modern philosophy. born into the french aristocracy in 1596
Consider a square loop. It has an edge length L = 0.38 m and carries a current I = 7.74 A (runing clockwise). What is the magnitude of the torque on the loop
A car wheel with a moment of inertia of 7.85 kg.m^2 is accelerating from 2160 rpm to 5040 rpm in a time of 10.0s. calculate The work done in raising the rotation frequency
a coil has an inductance of l=0.65mh and resistance of r=0.75 ohms . it is connected to the terminals of a battery with a emf of 1.5V, find the final steady-state or equilibrium current
q1. a combined cycle gas turbine power plant can run at 50 percent efficiency. assume such a plant delivers 1 gw of
A playground merry-go-round (uniform disk with mass M=150kg and radius R=2m) rotates on a frictionless axle through its center. What is the kinetic energy of the child-merry-go-round-system
George just graduated from college and is going on his first job interview. He has learned that there are two other candidates. Because of the information he has learned about the serial position effect, George asks to be either the first or the last..
a uniform electric field of magnitude 2.5x10^4 N/C makes an angle of 28 degree with a plane surface of area0.0133 m^
An electron with an initial speed of 4.00×105m/sis brought to rest by an electric field, What was the initial kinetic energy of the electron, in electron volts
The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 nm(red) and 486 nm (blue). What is the distance between the first-order red and blue fringes? (d=)
A 115 V electric iron draws 5.57 A of current. How much heat is developed per hour, What is the temperature of the bath
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