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A hiker, who weighs 934 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3510 N, and rests on two concrete supports, one at each end. He stops one-fifth of the way along the bridge. What is the magnitude of the force that a concrete support exerts on the bridge at the near end?
The kiloton, which is used to measure the energy released in an atomic explosion, is equal to about 4.02 x 1012 J (approximately the energy released in the explosion of 1,000 tons of TNT). Recalling that 1 kilocalorie of energy raises the temperature..
The aurora is caused when electrons and protons, moving in the earth's magnetic field of ?5×10?5 T, collide with molecules of the atmosphere, find Radius of the electron and proton in m
Suppose you have two ice cube trays.One is filled with hot water and the other with cold water. Which tray will produce ice cubes first
a wooden ring whose mean diameter is 14.0 cm is wound with a closely spaced toroidal winding of 600 turns. compute the
Two polarizers are out of alignment by 30°. If light of intensity 7.57 W/m2 and initially polarized halfway between the polarizing angles of the two filters passes through the two filters, what is the intensity of the transmitted light?
a 75 g frisbee is thrown from a point 0.9 m above the ground with a speed of 12 ms. when it has reached a height of 1.9
assuming the average person has a mass of 68kg? Do not avoid the weight of the logs. Assume the specific gravity of wood is 0.6.
A wire is formed so as to make a circular loop connecting two long, straight sections as shown in the figure below. If the radius of the loop is R = 48 cm and the wire carries a current I = 2.2 A, what are the magnitude and direction of the magnet..
In an advanced laboratory class a student performs the photoelectric experiment. Ultraviolet light is shone on a particular metal and the stopping potential is measured at the same time. What is Planck's constant based on this measurement
An airplane accelerates down a runway at 3.20 m/s2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff
The shell, with radius R and negligible thickness, has net charge - 4.00 q. Find out an expression for the electric field strength outside the sphere, r> R.
A 103.29 cm-long steel string with a linear density of 2.56 g/m is under 240.31 N tension. What is the wavelength of the sound wave that reaches your ear in a 11.65oC room
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