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Calculate the efficiency of a fossil-fuel power plant that consumes 380 metric tons of coal each hour to produce useful work at the rate of 800 MW. The heat of combustion of coal (the heat due to burning it) is 28 MJ/kg.
On the Moon\'s surface, lunar astronauts placed a corner reflector, off which a laser beam is periodically reflected. What is the difference in travel time for light that travels only through space to the moon and back and light that travels through..
A tuning fork vibrates at a frequency of 530 Hz. An out-of-tune piano string vibrates at 535 Hz. How much time separates successive beats
Two capacitors C1 and C2 are connected in parallel to one another, Find the equivalent capacitance of the system if the C1, C2, C3 are respectively 4, 6, 3.6 uF respectively
A tank 2.30 meters in height is filled with water to a level of 2.10 meters. At the bottom of the tank a hose is attached. Find the velocity of the water coming out of the hose
If the particle is released from rest at the midpoint C, s=100mm, and the acceleration is measured as a= (4s) m/s2 , where s is in meters, evaluate the velocity of the particle when it reaches plate B, s=200mm, and the time it needs to travel C to ..
Ice at -14.9 °C and steam at 115 °C are brought together at atmospheric pressure in a perfectly insulated container. After thermal equilibrium is reached, the liquid phase at 52.0 °C is present.
The cohesive energy of a sodium chloride crystal is 6eV per ion pair, Neglecting the energy of repulsion, estimate the interionic spacing
A muon is produced by a collision between a cosmic ray and an oxygen nucleus in the upper atmosphere at an altitude of 50 km, What is the velocity of a muon at the surface
A flywheel having constant angular acceleration requires 4.6-{rm s} to rotate through 162 rad. Its angular velocity at the end of this time is 100 rad/s. Find out the angular velocity at the beginning of the 4.6s interval; the angular acceleration..
If the car is now at rest and the pendulum undergoes S.H.M. would its time be shorter of longer than that calculated in (b) explain your answer.
A circuit contains six 205 ohm lamps with 60 W bulbs and a 9 ohm heater connected in parallel. voltage across the circuit is 120 V.what is the current in the circuit when four lamps are turned on.
A block with mass m = 5.00kg slides down a surface inclined 36.9 ? to the horizontal (the figure (Figure 1) ). The coefficient of kinetic friction is 0.27. What is the acceleration of the block down the plane
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