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At a coal-burning power plant a steam turbine is operated with a power output of 465 MW. The thermal efficiency of the power plant is 31.6%. (a) At what rate is heat discarded to the environment by this power plant? (b) At what rate must heat be supplied to the power plant by burning coal?
An electric vehicle starts from rest and accelerates at a rate of 1.7 m/s2 in a straight line until it reaches a speed of 27 m/s. How much time elapses from start to stop
UV light of wavelength 211 nm falls on a silver surface whose work function is 4.74 eV. Find the maximum speed of the photoelectrons emitted from the surface
An electric point charge of Q1 = 7.85 nC is placed at the origin of the real axis. Another point charge of Q2 = 3.83 nC is placed at a position of p = 3.99 m on the real axis. At which position can a third point charge of q = -7.31 nC be placed so th..
If the charge is 23 mu/C, the velocity is 1500 m/s, find the force (magnitude and direction) on the charge.
When a liquid and its vapor are in equilibrium, the rates of evaporation of the liquid and condensation of the vapor are equal. Compute the rate of evaporation of mercury into a vacuum
A woman at an airport is towing her 15.0-kg suitcase at constant speed by pulling on a strap at an angle ? above the horizontal. What angle does the strap make with the horizontal
A 9.8 V battery is connected to a bulb whose resistance is 1.4 . How many electrons leave the battery per minute
A 42 kg child is riding on a carousel (merry-go-round) at a constant speed of 6 m/s. What is the magnitude of the change in the child's momentum |Δp with arrow| in going all the way around (360°)?
A person driving her car at 48 km/h approaches an intersection just as the traffic light turns yellow. The yellow light lasts only 2.0 s before turning to red, how far will she travel before stopping
Bats are capable of navigating using the earth's field-a plus for an animal that may fly great distances from its roost at night. If, as sleeping during the day, bats are exposed to a field of a equal magnitude but different direction than the earth..
For a rough calculation, we shall assume that the doctor is 50 from the baby (she is likely to be even closer at delivery), has a mass of 75.00, and can be modelled as a uniform sphere.
A certain telescope has an objective of focal length 1580cm. If the Moon is used as an object, a 1.4 cm long image formed by objective corresponds to what distance, in miles, on the Moon? Suppose 3.8 multiplied by 108 m for the Earth-Moon distance..
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