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A 74 kg man in a 6.0 kg chair tilts back so that all the weight isbalanced on two legs of the chair. Assume that each leg makescontact with the floor over a circular area with a radius of1.0 cm, and find the pressure exertedby each leg on the floor.
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A lens placed at the origin with its axis pointing along the x axis produces a real inverted image at x=-24cm that is twice as tall as the object
Consider a diffraction grating with 7000. lines/cm with a screen 2.50 m away and 440. nm wavelength light. How many side maxima would be observed on one side of the central maximum
Suppose that you loft the ball with an initial speed of v = 16.2 m/s, at an angle of ? = 49.4° above the horizontal. With what minimum average speed must he move
A small ball is attached to one end of a spring that has an unstrained length of 0.152 m. By how much would the spring stretch if it were attached to the ceiling and the ball allowed to hang straight down, motionless
an ideal gas has a pressure of 2.5, a volume of 1.0L at a temperature of 30degress C. How many molecules are there in the gas
A Carnot engine uses hot and cold reservoirs that have temperatures of 1850 and 845 K, respectively. The input heat for this engine is QH. The work delivered by the engine is used to operate a Carnot heat pump. The pump removes heat from the 845-K re..
A hand-pumped water gun is held level at a height of 0.61 m above the ground and fired. Find the gauge pressure of the water gun's reservoir at the instant when the gun is fired
One particle has a mass of 4.41 x 10-3 kg and a charge of +6.92 ?C. A second particle has a mass of 6.52 x 10-3 kg and the same charge. The two particles are initially held in place and then released.
A small block with mass 1 kg slides in a vertical circle of radius 0.5 m on the inside of a circular track. how much work is done by the friction force on the block
In addition to dark matter cosmologists have proposed dark energy. The reason for this was the discovery of: A) slowing down of the expansion of the universe B) cosmic background radiation C) acceleration of the expansion of the universe D) gravitati..
Two guitarists attempt to play the same note of wavelength 6.50cm at the same time, What is the frequency of the beat these musicians hear when they play together
The drill bit of a variable-speed electric drill has a constant angular acceleration of 5.21 rad/s2. The initial angular speed of the bit is 5.12 rad/s. what is the bit's angular speed
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