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Find the minimum diameter of an l = 18.2 m long aluminum wire that will stretch no more than 7.70 mm when a mass of 339 kg is hung on the lower end. (Hint: The Young's modulus of aluminum is 70.0 GPa.)
A see-saw board is supported at its center by a fulcrum A 25 kg person sits 80 cm from center. How much force does the fulcrum exert on board
A spherical water drop, 1.20 ?m in diameter, is suspended in calm air owing to a downward-directed atmospheric electric field E = 432 N/C. What is the weight of the drop
An electric field of 300 V/m is confined to a circular area d = 11.1 cm in diameter and directed outward perpendicular to the plane of the figure. If the field is increasing at the rate of 22.0 V/m·s, what are direction and magnitude of the magnet..
An electron is accelerated by a constant electric field of magnitude 280 N/C. Find the acceleration of the electron
the bridge is 3910m long and is constructed of steel. how much longer is the bridge on a warm summer day (30.0 C) than on a cold winter day (-5.0 c)
What is the acceleration of two falling sky divers (mass 117.0 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight
An automobile has mass 990 kg (including passengers). It is pushed down by 1.9 cm for every additional 100 kg of passengers. Find the amplitude of oscillation of the automobile
a catcher catches a 145 g baseball traveling horizontally at 36.0 m/s. How large an impulse does the ball give to the catcher, what average force did the ball exert on the catcher
People who do chin-ups raise their chin just over a bar (the chinning bar), supporting themselves only by their arms. Find the force his arms must exert on him during the accelerating part of the chin-up
A small object is placed to the left of a convex lens and on its optical axis. The object is 30 cm from the lens, which has a focal length of 48 cm. Describe the nature of this new image
A spacecraft has a nonrelativistic (or classical) momentum whose magnitude is 1.4×1014 kg·m/s. Find the relativistic momentum of the spacecraft
4m, 32 degrees east of north 57.3m, 36 degrees south of west 17.8m, straight south. calculate the resultant displacement vector
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