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Jay is 120 meters from the base of a building and Mary is 40 meters from the base of the building. Jay's angle of elevation when looking at the top of the building is X and Mary's is 2X. What is the height of the building?
An object weighing 32 lb is released from rest 50 ft above the surface of a calm lake. Before the object reaches the surface of the lake, the air resistance (in lbs) is given by 2v, where v is the velocity (in feet per second).
When the power is turned off on a turntable spinning at 82.0 rpm, you find that it takes 10.8 revolutions for it to stop while slowing down at a uniform rate. How long does it take to stop after the power is turned off
Bill can throw a ball vertically at a speed 1.4 times faster than Joe can. How many times higher will Bill's ball go than Joe's
A simple magnifier of refractive power 15.0 D is used to observe a beetle on a student's desk. where is the image formed relative to the lens
Three point charges are arranged in a horizontal line as shown below. Find the electric force on Q1 given the following: Q1 = -4 mC, Q2 = -5 mC, Q3 = 3 mC, r1 = 80 m, and r2 = 160 m. What is the sum of the forces on all three charges
If on a microscopic level, the smallest particles that make us up move with us as we move, certainly they are moving extremely fast in relation to their size, so if our universe was now part of a tiny particle making up something ridiculously big and..
A metal wire has a resistance of 10.00 ? at a temperature of 20 0 C. If the same wire has the resistance of 10.55 ? at 90 0 C, what is the resistance of the wire when its temperature is -20 0 C
A block with a mass m= 5.7 kg is pulled up a 29 degree incline with the force of magnitude F = 38N. Find the acceleration of the block if the incline is frictionless
Charged particles round a 1.7 km radius circular particle accelerator at nearly the speed of light. Find the centripetal acceleration of the charged particles
At the 18th green of the U. S. Open you need to make a 20.5 ft putt to win the tournament. Assuming the deccelration caused by the grass is constant, what should the initial speed have to be to make the putt
A block of mass 5.1kg rests on a plane inclined at an angle of22degrees. What is the frictional force on the block
This is a monochromatic light. Two thin slits are separated by 0.150 mm which is placed 2.3 meters away. What is the wavelength and the color of light
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