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Electric power is transferred over large distance sat very high voltages. Describe how the high voltage reduces power losses in the transmission lines.
Assume you are a medieval knight attacking a castle with a cannon. The cannonball leaves the cannon with a speed of 40.7 m/s, What is the time of flight of the cannonball
A car approaches the top of a hill that is shaped like a vertical circle with radias, r=55.0m. What is the fastest speed a car can go
If a soldier shoots an enemy with the intent of killing him, he wants the bullet to deliver maximum energy. On the other hand, if he wants to basically knock someone down (say for dispersing a riot) he wants the bullet to deliver maximum force.
an explorer is caught in a whiteout in which the snowfall is so thick that the ground cannot be distinguished from the
an empty rubber balloon has a mass of 0.0115 kg. the balloon is filled with helium at a density of 0.181 kgm3. at this
A parallel-plate capacitor has 1.85 cm2 plates that are separated by 5.72 mm with air between them. how much energy does it store
A mass m slides without friction on a 1-dimensional track. The mass is moving from left to right with initial velocity v0. Determine the position where the mass will come to rest
Two point charges are on the y axis. A 3.30-µC charge is located at y = 1.25 cm, and a -2.06-µC charge is located at y = ?1.80 cm. Find the total electric potential at the origin
A time dependent force F =8i - 4t j N (where t is in sec.) is applied to a 2.00 kg object initially at rest. How much work has the force done during the 5 sec. time interval
A 640- hollow ball 19 in diameter is suspended by a wire and is undergoing torsional oscillations at a frequency of 0.78 What is the torsional constant of the wire
A vertical solid steel post of diameter d = 21.4cm and length L = 2m is required to support a load of mass m = 7650kg. What is the stress in the post
Calculate the thickness of the layer between the 1000- and 500mb pressure surfaces (a) at a point in the tropics where the mean virtual temp of the layer is 9C and (b) at a point in the polar regions
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