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A student who weighs 500 N climbed the stairs from the firstfloor to the third floor, 15 m above, in 20 sec.
a) How much work did she do?b) What was her power?
A 65 kg person jumps from awindow to a fire net 23 m below, whichstretches the net 1.5 m. How much would it stretch if the person jumped from 30 m
Water rises in a capillary tube to a height of 8cm. Water hasa surface tension of 73 dynes/cmand a contact angle of 20 degrees. What is the diameter of the capillary
Illustrate what is the time necessary for crossing if the hunter wishes to move neither upstream nor downstream whilst crossing the river? Draw the vectors to scale on a graph to determine the answer.
A 0.5 kg cart is pushed by a force of 6.2 N for a total distance of 3.2 m. what would the velocity of the cart be when the force stops
A spring with constant k=15 N/m hangs from the ceiling. A ball is attached to the spring and allowed to come to rest. it is then pulled down 6 cm and free. if the ball makes 30 oscillations in 20 seconds, what are its maximum speed.
A box with a total surface area of 1.11 m2 and a wall thickness of 3.1 cm is made of an insulating material. Find the thermal conductivity of the insulating material
According to the shop manual, when drilling a 11.8mm--diameter hole in wood, plastic, or aluminum, a drill should have a speed of 1400 rev/min. Find the maximum radial acceleration of any part of the bit
Starting from rest, a 12 cm diameter compact disk takes 2.4 s to reach its operating angular velocity of 1925 rpm. How much torque is applied to the disk
To test the effects of high acceleration on the human body, NASA has constructed a large centrifuge at the Manned Spacecraft Center in Houston. what must be the speed of the capsule
A 0.1kg ball is attached to a string and whirled around in a circle overhead, What is the maximum speed the ball can have when the radius of corcle is 1m
A square steel plate is 0:20 m on a side and 4:00 mm thick. Find the shear strain that results if a force of magnitude 8x10^4 N applied to two of the four long sides parallel to the sides
During a drive by golfer, the angular velocity of his club is zero at the top of the backswing and 34 rad/s at the bottom of the downswing just before impact with the ball, what is the average angular acceleration of the club
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