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The electrical resistance on a long piece of wire is R. The wire is streatched to be twice as long, and because the volume doesnt change its cross-sectional area is halved. The electrical resistance of the stretched wire is:
a. R/2
b. R
c. 2R
d. 4R
An explosion breaks an object into two pieces, one of which has 1.5 times the mass of the other. how much kinetic energy did each piece acquire
The force has magnitude 5.4 N and is directed at a counterclockwise angle of 103° from the positive direction of the x axis. How much work is done by the force on the coin during the displacement
four moles of an ideal gas are caused to expand from a volume v1 to a volume v2 2v1.a if the expansion is isothermal
Kim says that she was less than 10 ft away from the president when she took a picture of him with her 45-mm focal length camera lens. How close was Kim to the president when she took the picture
a parallel plate capacitor has an air dielectric. the capacitor is charged with surface charge density s0 and then the
A fine metal foil separates one end of two pieces of optically flat glass, as in Fig. 24-33. How thick is the foil
A woman stands at the edge of a carousel that is rotating without friction at 0.80 rad/s. The carousel has a radius of 2.0m and a moment of inertia of 600 kg m2. What is now the angular speed of the carousel
A tetherball leans against the smooth, frictionless post to which it is attached. The string is attached to the center of the ball. If the string is L = 1.20m long and the ball has a radius of r = 0.150m with mass m = 0.250kg
A bicycle has wheels with a diameter of 0.650 m. Find the linear acceleration of the bicycle
suppose that a particle accelerator is used to move two beams of particles in opposite directions. in a particular
A steel bicycle wheel (without the rubber tire) is rotating freely with an angular speed of 14.9 rad/s. What is the angular speed of the wheel at the higher temperature
In the field of psychology, what is meant by the term “catharsis”? According to Joseph Bruer, Illustrate what effect did “catharsis” have on the mental functioning of someone with a “troubled mind”? Why?
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