An electrical generating plant operates at a boiler temperature of 225°C and exhausts the unused heat into a nearby river at 25.0°C. If the generating plant has a power output of 850 megawatts (MW) and if the actual efficiency is 3/4 the theoretical efficiency, how much heat per second must be delivered to the boiler? (0°C = 273 K)
a. 8 470 MW
b. 4 230 MW
c. 2 120 MW
d. 2 820 MW
e. 1 690 MW
d
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The horizontal surface on which the block slides is frictionless. The speed of the block before it touches the spring is 6.0 m/s. How fast is the block moving at the instant the spring has been compressed 15 cm? k = 2.0 kN/m
A. 3.7 m/s B. 4.4 m/s C. 4.9 m/s D. 5.4 m/s E. 14 m/s
Two spaceships approach each other along a straight line at a constant velocity of 0.988c as measured by the captain of one of the ships. An observer on Earth is able to measure the speed of only one of the ships as 0.900c
From the point of view of the observer on Earth, what is the speed of the other ship?
The pressure exerted by a gas is the result of
a. the Bernoulli effect. b. molecular collisions. c. Pascal's principle. d. the ideal gas law. e. none of the above.
In an energy level transition from the n = 2 state to the n =1 state for a hydrogen atom a photon will be emitted
Indicate whether the statement is true or false