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A certain centrifuge produces a centripetal acceleration of magnitude exactly 1230g at a point 11.9 cm from the axis of rotation. Find the number of revolutions per second?
On a cold day, 16000 J of heat leaks out of a house. The inside temperature is 20.0° C, and the outside temperature is -18° C. What is the increase in the entropy of the universe that this heat loss produces?
A 2.00-m tall basketball player is standing on the floor 10.0 m from the basket. If he shoots the ball at a 40 degree angle from the horizontal, at what initial speed must he throw the ball so that it goes through the basket without striking the b..
A given copper wire has a resistance of 5.11 ? at 20.0°C while a tungsten wire of the same diameter has a resistance of 4.61 ? at 20.0°C
A uniform plank of length 5.5 m and weight 205 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support .To what distance x can a person who weighs 447-N walk on the overhanging part of the plank before it just ..
A hypodermic syringe contains a medicine with the density of water. The barrel of the syringe has a cross-sectional area of 2.5 x10-5 m2.
A flight attendant pulls her 69N flight bag a distance of 246m along a level airport floor at a constant velocity. The force she exerts is 37N at an angle of 58° above the horizontal. Find the coefficient of kinetic friction between flight bag and..
A Carnot engine operates between 27C and 927C and preforms 4800 J of work. Calculate the net entropy change during one cycle
Two spectators at a soccer game in Montjuic Stadium see, and a moment later hear, the ball being kicked on the playing field. How far is each spectator from the player
What were the initial charges on the spheres? Since one is negative and you cannot tell which is positive or negative, there are two solutions.
A 1500 kg car increases its speed from 15 m/s to 18 m/s in 15 seconds. What is the resultant work done on the car
A 30 kg child is sitting on the outer edge of a 100 kg carousel with a radius of 2.0 m. What is the moment of inertia of the carousel and child
An observation satellite orbits the planet at a height of 1000. What is the projectile's speed as it passes the satellite
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