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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?
Four rays of light are incident on a surface of water. Their angles of incidence are 20, 30, 45, y 60 degrees. Calculate the angle of refraction for each ray
What is the distance of closest approach of the two particles? (Assume that the gold nucleus remains stationary
A 11.0 cm -diameter compressed-air tank is 70.0 cm tall. The pressure at 30.0 degrees C is 130 atm. How many moles of air are in the tank
Your are sitting in your car, which is standing at the side of the road with the engine idling. After what distance will you catch up with your classmate
a spring has a length of .248m when a .300kg mass hangs from it, and a length of .750m when a 2.22kg mass hangs from it. what is the unloaded length of the spring
q. a pump submerged at the bottom of a well that is 35m deep is used to pump water uphill to a house that is 50m above
Two point charges are placed on the y axis as follows: charge q1= -1.50 nC at y= -.600m, What is the net force (magnitude and DIRECTION) exerted by these two charges on a third charge
Carl and Lenny are trying to find Carl's keys that are beeping-he attached a device to beep when you whistle for this purpose, how far is Lenny from the key's
An 2400W arc welder is connected to a 660?Vrms ac line, Calculate the peak voltage and Calculate the peak current
The work needed to remove an electron from the surface of sodium is 2.3 eV. How big maximal velocity will have electrons if the surface of sodium will be illuminated with ultraviolet light wave length
A small grinding wheel has a moment of inertia of 4.0×10-5 kg m^2. What net torque must be applied to the wheel for its angular acceleration to be 160 rad s^2.
A bat is flying 5 m/s while chasing an insect that is flying in the same direction. What is the speed of the insect
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