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A storage tank has a diameter of 80 ft, a height of 25 feet, andcontains oil to a height of 15 ft. The suction pumps, whichcan handle 15, 000 bbl/d are started, but the safety valves areclogged and a vacuum is drawn in the tank. The roof is flatand rated to withstand 1.0 oz/sq in. before collapsing. The barometric pressure is 30 in Hg. How long will it take thetank to collapse? What is the total force on the roof at collapse? How would more oil in the tank have affected the collapse time?
rotates to provide an "artificial gravity" of 3.10 m/s2 for persons who walk around on the inner wall of the outer rim. Find out the rate of rotation of the wheel (in revolutions per minute) that will produce this effect.
if two neutral conducting pop cans are touching each other and a positively charged ballon is brought near them then
A person of mass 75 kg stands at the center of a rotating merry-go-round platform of radius 3.1 m and moment of inertia 1300 kg ·m2. Calculate the angular velocity when the person reaches the edge
A ball of mass 0.640 kg moving east (+x direction) with a speed of 3.50 m/s collides head-on with a 0.84 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each ball after the collision?
A horizontal force of 750 N is needed to overcome the force of static friction between a level floor and a 250-kg crate. what is the coefficient of static friction
A 1-cm-thick layer of water stands on a horizontal slab of glass. After entering the glass, what is the ray's angle from the normal
The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. Evaluate how far does he slide?
A visual binary has a parallax of 0.4" (arcsec), a maximum separation (in arcsec) of a=6.0", and an orbital period P=80 y. What is the total mass of the binary system
Using the Bohr model what is the radius of the electron orbit in the Hydrogen atom when the electron is in the n = 12 state? What is the energy of the Hydrogen atom when the electron is in the n = 3 state?
A positive charge moves in a region where the magnetic field is uniform, has a magnitude of 60 uT and points in the positive x direction. what is the radius of the resulting path
1. suppose that you want to cook a 1 inch 2.5 cm thick steak to medium doneness which is an internal temperature of
The total current delivered to a number of devices connected in parallel is the sum of the individual currents in each device. Obtain the total current delivered by the source
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