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Suppose that resting on your non-conducting desktop is a tiny piece of paper (m= 0.08 g) that happens to carry a charge of +4x10^-10 C. You comb your hair, and then slowly lower your comb toward the paper until, when it is 3 cm away, the paper jumps up to the comb. Give an approximate value for the charge on the comb. Does the comb carry an excess of electrons or of protons? How many?
If the lithospheric plates move on average at 6 cm/yr, what would be a typical recycling time of terrestrial crust
A thin soap film (n = 1.33) has the uniform thickness. When white light strikes the film at normal incidence, blue light (b = 440 nm) is constructively reflected.
A spaceship is 1600 m long when it is at rest. When it is traveling at a certain constant speed its length is measured by external observers and it is found to be 795 m. How much time does the roast beef spend in the oven
An unstrained horizontal spring has a length of 0.37 m and a spring constant of 340 N/m. Two small charged objects are attached to this spring, one at each end. The charges on the objects have equal magnitudes.
A solid disk of mass M and radius R is pivoted so that it can rotate about its center. The disk is initially at rest. A ball of mass m and speed v travels along a path tangential to the rim of the disk. The ball sticks to the disk and the assembly..
A 4.0kg mess kit sliding on a frictionless surfaceexplodes into two 2.0gk parts, one moving at 3.0m/s, What is the orginal speed of the mess kit
The combination of two circular, coaxial coils of radius a separated by a distance also equal to a, with equal currents I in each coil circulating in the same direction, is known as a pair of "Helmholtz Coils." Assuming the coils are parallel to t..
How much friction must be exerted between the skates and ice.
A 0.20 kg body undergoes simple harmonic motion of amplitude 9.7 cm and period 0.20 s. What is the magnitude of the maximum force acting on it
A small 600 g ball on the end of athin, light rod is rotated in a horizontal circle of radius1.6 m. Calculate the moment of inertia of the ball aboutthe center of the circle
A rectangular loop lies next to a long straight wire, on the same plane. Both wires carry a current of 3A. find the magnitude and the direction of the net force on each loop
how long will it take a sound wave to travel 10 cm if the velocity is 100 m/s. what is the propagation speed of water that travels 6 cm in 4 seconds
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