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Approximation the electrical energy stored in the atmosphere, if the earth's electric field extends upward for 1700 m. and has average magnitude of 170 V./m. Treat the atmosphere as a rectangular layer with an area equivalent to the surface area of the earth
A 0.55 kg- croquet ball is initially at rest on the grass. When the ball is struck by a mallet, the average force exerted on it is 200N. If the ball's speed after being struck is 3.5 m/s , how long was the mallet in contact with the ball?
hearing damage may occur when a person is exposed to a sound intensity level of 90.0 db relative to the threshold of
A 2.00 kg particle moves in the xy plane with a velocity of v = (4.00 - 3.30 ) m/s. Determine the angular momentum of the particle
A long solenoid that has 940 turns uniformly distributed over a length of 0.390 m produces a magnetic field of magnitude 1.00 10-4 T at its center. What current is required in the windings for that to occur
An 80 kg person climbs a set of stairs that are 5 meters high. How much gravitational potential energy does she gain
what is the resolving power of a microscope (lamda = 550 nm) with a 5-mm-diameter objective which has focal point of= 9mm
A viewing window in the Atlanta aquarium is 67 inches wide and 43 inches high. what is the outward force on the window
A 150- crate, starting from rest, is pulled across a floor with a constant horizontal force of 360 . For the first 11 the floor is frictionless, and for the next 11 the coefficient of friction is 0.31. Illustrate what is the final speed of the c..
Two in-phase speakers 2.0 m apart in a plane are emitting 1800 Hz sound waves into a room where the speed of sound is 340m/s . Is the point 4.0m in front of one of the speakers, perpendicular to the plane of the speakers, a point of maximum constr..
Two people with a combined mass of 134 kg hop into an old car with worn-out shock absorbers. This causes the springs to compress by 9.00cm. Find the total load supported by the springs
an energy bar contains 18g of carbohydrates. if the energy bar was his only fuel how far could a 68kg person walk at
given heat 1000 j is input to a carnot engine at 300 degrees celsius and waste heat rejected at 10 degrees C. find the thermal efficiency of the engine and the work performed
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