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An electricity generating station has a rated output of 300 megawatts. Given that the station heat rate is 12 000kJ/kW-h, and the coal used has a heat value of 23 000kJ/kg, find the minimum possible belt-drive power required for the bunker coal conveyor in order to keep the boiler supplied when the station is on full load. The conveyor is to rise 15 m at an inclination of 18 degrees to reach the bunkers. The belt runs at 3.5 m/s and the mass of belt used in 7.5kg/m.
A rock is tossed straight up with a velocity of 21m/s When it returns, it falls into a hole 10m deep. What is the rock's velocity as it hits the bottom of the hole
Two identical blocks of iron, one at 15°C and the other at 30°C are put in thermal contact with one another. What this violate the first law of Thermodynamics
a short bar magnet placed with its axis at 30ordm with a uniform external magnetic field of 0.25 t experiences a torque
What is the equivalent capacitance between points a and b? If a battery of voltage 35.0 volts is connected across points a and b, what voltage will appear across the capacitor identified with a star?
Assume that it takes 2.30 kg of oxygen to burn 1.00 kg of coal. (The actual amount varies with the type of the coal). What is the total mass of the reagents used in the combustion all through the 30 days.
A uniform magnetic field (0.20 T) is directed 35 degrees above the horizontal, penetrating a horizontal circular coil (radius 6.0 cm)
A 4.00 kg block is free from rest 2.0m high at the top of a 30 degree frictionless incline. The block makes a head-on elastic collision with another 3.00 kg block initially at rest on a horizontal surface at the bottom of the incline.
If a 68.3 kg person were travelling at 0.960c (where c is the speed of light), what would be the ratio of the person's actual kinetic energy to the person's classical kinetic energy
As measured in Earth's frame of reference, two planets are 485,000 km apart. How fast is the ship traveling
1.(a) If the coefficient of kinetic friction between tires and dry pavement is 0.85, what is the shortest distance in which you can stop an automobile by locking the brakes when traveling at 26.3 m/s (about 59 mi/h)? __________ m (b) On wet pavement ..
Two electrons are fixed 2.00 centimeters apart. Another electron is shot from infinity and comes to rest midway between the two fixed electrons. Find the initial speed of the electron
A galvanometer has a coil resistance of 29.0 ?. It is to be made into a voltmeter with a full-scale deflection equal to 100.0 V, what size resistor should be placed in series with the galvanometer
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