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long-distance electric-power transmission lines always operate at very high voltage. what are the advantages and disadvantages of such high voltages?
A 5.7-kg block is pushed 4.0 m up a vertical wall with constant speed by a constant force of magnitude F applied at an angle of ? = 30° with the horizontal, as shown in the figure below.
The loop shown below is immersed in a uniform magnetic field that points into the page and stretches across the entire page.
A lighter-than-air spherical balloon and its load of passengers and ballast are floating stationary above the earth. determine how much weight must be dropped overboard to make the balloon rise 122m in 23 s
A horizontal force of 210N is exerted on a 2.0 kg discus as itrotates uniformaly in a horizontal circle ( at arm's length ) ofradius .90 m. Calculate the speed of the discus
Think of the relationship between Kirchoff's Junction Rule and conservation of charge, Why cant charge build up at a junction of wires
In a refrigerator the working fluid remains a gas throughout the cycle. Its working may be described in a greatly simplified form as a sequence of four steps as follows: 1 The fluid passes through the refrigerated compartment, where its temperatur..
A random sample of 42 college graduates revealed that they worked the average of 5.5years on the job before being promoted. The population standard deviation was 1.1 years. Using 0.99 degree of confidence, what is the confidence interval for the po..
A spherical planet is discovered by astronomers orbiting a star which has the same mass as our Sun. The orbital period of the planet is 2.55 Earth years, How far from the star (in AU) does the planet orbit
A daring ranch hand sitting on a tree limb wishes to drop vertically onto a horse galloping under the tree. The constant speed of the horse is 10.0 m/s, and the distance from the limb to the level of the saddle is 3.00 m.
q1. the force vector a has a magnitude of 84.0 newtons n and points due east. the force vector b has the magnitude of
Sodium light (589.3 nm) from a narrow slit illuminates a Fresnel bi-prism made of glass of refraction index 1.5. What is the biprism angle
A solar cell generates a potential difference of 0.400 V when a 150.0 ? resistor is connected across it, What is the emf of the cell
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