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An adventurous crosses between two rock cliffs by slowly going hand over hand along a rope stretched between the cliffs. He stop to rest at the middle of the rope. The rope will break if the tension in it exceeds 2.50x10^4 N, and our hero's mass is 90.0 kg. a) If the angle 0 is 10.0degree, find the tension of the rope b) What is the smallest value the angle 0 can have if the rope is not to break?
Estimate the shear stress if this force is ex- erted on a 0.412 cm -thick pine board that is 13.7 cm wide
A coil of inductance 70 mH and unknown resistance and a 0.85 µF capacitor are connected in series with an alternating emf of frequency 980 Hz. what is the resistance of the coil
A hairpin configuration is formed of two semiinfinite straight wires that are 3.42 cm apart and joined by a semicircular piece of wire (whose radius must be 1.71 cm, Find the magnetic field at the origin of the coordinate system
When specially prepared Hydrogen atoms with their electrons in the 6f state are placed into a strong uniform magnetic field, If we don't neglect the intrinsic spin of the electrons, then how many energy levels can we observe in the ground state
Four identical metallic objects carry the following charges: +1.18, +6.89, -4.92, and -9.56C. The objects are brought simultaneously into contact, What is the final charge on each object
A golfer tees off on level ground, giving the ball an initial speed of 38.5 m/s and an initial direction of 36.0° above the horizontal. (a) How far from the golfer does the ball land? (Neglect air resistance.)
It is a damp, chilly day in a New England seacoast town suffering from a power failure. how much heat must flow into the water
A physics book slides off a horizontal tabletop with a speed of 2.30 m/s. It strikes the floor in 0.350 s. Find the height of the tabletop above the floor
When at rest, two trains have sirens that emit a frequency of 300 Hz. The trains travel toward one another and toward an observer stationed between them, What is the speed of the second train
A 65-kg woman cheats on her diet and eats a 612-Calorie (612 kcal) jelly doughnut for breakfast. If the human body is only 21% efficient in converting chemical energy to mechanical energy, how many stairs must the woman climb to work off her breakf..
A copper washer is to be fit in place over a steel bolt. Both pieces of metal are at 29.7°C. to what temperature must the washer be raised so it will fit over the bolt
You desire to observe details of the Statue of Freedom, the sculpture by Thomas Crawford that is the crowning feature of the dome of the United States Capitol in Washington D.C. what focal length should the eyepiece have
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