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A village maintains a large tank with an open top, containing water for emergencies. The water can drain from the tank through a hose of diameter 6.55 cm. The hose ends with a nozzle of diameter 2.00 cm. A rubber stopper is inserted into the nozzle. The water level in the tank is kept 7.50 m above the nozzle.
(a) Calculate the friction force exerted by the nozzle on the stopper.
_______________. N
(b) The stopper is removed. What mass of water flows from the nozzle in 2.00 h?
____________kg
A hospital nurse walks 25 m to a patient's room at the end of the hall in 0.50 min. She talks with the patient for 4.0 min, What was the nurse's average speed
A certain siren radiates sound uniformly in all directions. At a distance of 17m from the siren, How many watts of power does the siren put out
You are working out on a rowing machine. Each time you pull the rowing bar (which simulates the "oars") toward you, compute the magnitude of the force that you exert on the handle
A 62.0 m length of insulated copper wire is wound to form a solenoid of radius 2.1 cm. The copper wire has a radius of 0.53 mm. How long is the resulting solenoid
In the annual battle of the dorms, students gather on the roofs of Jackson and Walton dorms to launch water balloons at each other with slingshots, Find the direction of the balloon's inital velocity
A 662-keV photon is Compton scattered at an angle of 120degree with respect to its incident direction. What is the energy of the scattered electron? What is the angle between the paths of the scattered electron and photon?
What current is in the primary circuit. A proton moves at a speed of 8.0 103 m/s as it passes through a magnetic field of 0.55 T. Find the radius of the circular path. Note down that the charge carried by the proton is equal to that of the electron..
A ball of 1.0 kg mass is tied to the end of a 1m string spinning at a speed of 7 m/s. What angle with the vertical axis does the string make
Two forces, F1= (1.35i-0.95j)N and F2= (-0.85i+1.20j)N are applied on a moving object of mass 0.30 kg. What is the work done by the two forces
Two identical brass balls mounted on wooded posts initally have different amounts of charge, one +3uC and the other +15uC. What is the final charge in each ball
An object of mass b has a speed that changes with distance d according to v = bx^-n. What is the force as a function of d? What is the position as a function of time d(t=0)=d(initial).
The windpipe of a typical whooping crane is about 4.5 feet long. What is the lowest resonant frequency of this pipe
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