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Question: If wind blows at 44 m/s over a house, what is the net force on the roof if its area is 190 m2 and is flat? (At 20oC dry air has a density of 1.2 kg/m3).
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A 2.00kg block is pushed against a 400N/m spring, compressing it 22.0 cm. When the block is released, find the speed of the block just after leaving the spring
Two tugs A and B pull a ship along a direction XO. Tug A exerts a force of 30kN at an angle of 15 degrees to XO, Find the angle X for the resultant force on the boat to be along XO
A student moves a box of books by attaching a rope to the box and pulling with a force of 90.0 N at an angle of 30.0 degrees. Find the acceleration of the box
The drawing shows three identical springs hanging from the ceiling. determine the weight of the block hanging from the third spring
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the current is an inductor is .10 A and the frequency is 750 hz. if the inductance is .080 H what is the voltage across the inductor
Suppose you're skiing up a 20m tall slope at the indicated angle of inclination. What minimum initial speed must you have at the bottom to just make it to the top
A certain LCD projector contains a single thin lens. An object 29.5 mm high is to be projected so that its upright image fills a screen 2.52 m high. Find the focal length of the projection lens
A train moving with constant velocity travels 190 north in 11 and an undetermined distance to the west. How far west has the train traveled in this time
a concave mirror has a focal length of 15.0 cm. An object is placed 18.5 cm in front of the mirror. How tall is the object placed in front of the mirror
for a sphere e falls off with 1r2 for an infinite line charge e falls off with 1r for an infinite sheet of charge its
A skateboarder, with an initial speed of 2.5 m/s, rolls virtually friction free down a straight incline of length 19 meter in 3.4 second. Obtain at what angle is the incline oriented above the horizontal
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