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Q1. The electricity received at an electric substation has a potential difference of 2.80 10^5V. If the requires output is 440V, what must be the ratio of the turns of the step-down transformation?
Q2. A 1 km steel railroad rail is fastened securely at both ends when the temperature is 20C. With increasing temperature the rail begins to buckle. Assume the buckle is triangular, how high is buckle?
A 76 g, 40-{rm cm}-long rod hangs vertically on a frictionless, horizontal axle passing through its center. A 10 g ball of clay travelling horizontally at 2.70 m/s hits and sticks to the very bottom tip of the rod. To what maximum angle, measured fro..
Potassium iodide has an interplanar spacing of d = 0.296 nm. A monochromatic X-ray beam shows first-order diffraction maximum while the grazing angle is 7.8°. Compute the X-ray wavelength λ .
In a nebula, the amount of interstellar extinction in the visible wavelength band is 1.1 magnitudes. The thickness of the nebula is estimated to be 16 pc and it is located 458 pc away.
An object at rest explodes into three pieces of equal masses. One moves east at 23 m/s, while the second piece moves northwest at 14 meter per second. Find the velocity of the third piece?
Determine the force of gravity between earth (mass =6.0x10^24kg) and the moon (mass= 7.4x10^22kg). The average earth-moon distance is 3.8x10^8m.
An electric scooter has a battery capable of supplying 140 Wh of energy. If friction forces and other losses account for 60.0 percent of the energy usage, what altitude change can a rider achieve when driving in hilly terrain, if the rider and scoote..
How to find out speed of the block
A pitcher throws a fastball horizontally at a speed of 150 km/h toward home plate, 18.4m away. If the batters combined reaction and swing times total 0.37s, how long can batter watch the ball after it has left the pitcher's hand before swinging? In t..
When a pulse is amplified in a linear amplifier, the charge carrier transmit time can cause.
You've been walking at a steady, and rope pulls up on the sled at a 21 angle. You estimate that the mass of the sled, with your friend on it, is 64 and that you're pulling with a force of 84.0.
How long will it take you to cover the 99 m length of the walkway if, once you get on the walkway, you immediately turn around and start walking in the opposite direction with a speed of 1.5 m/s relative to the walkway.
A stone is dropped into a river from a bridge 43.90 m above the water. Another stone is thrown vertically down 1.00 after the first is dropped. The stones strike the water at the same time.
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