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An engine absorbs 1.67 kJ from a hot reservoir at 277°C and expels 1.18 kJ to a cold reservoir at 27°C in each cycle.
(a) What is the engine's efficiency?
%
(b) How much work is done by the engine in each cycle?
J
(c) What is the power output of the engine if each cycle lasts 0.298 s?
kW
A person driving her car at 57km/h approaches an intersection just as the traffic light turns yellow. She knows that yellow light lasts only 2.0 s before turning to red, and she is 30m away from the near side of the intersection.
Consider a standing wave on the string with a frequency equal to the fifth harmonic (fn = nf1 with n = 5). How many nodes and antinodes does this standing wave possess.
The power supply for a pulsed nitrogen laser has a 0.0050-mF capacitor with a maximum voltage rating of 30 kV, calculate the power of the laser pulse
A 100-W lightbulb has a resistance of about 12 ? when cold (20 ?C) and 140? when on (hot). Estimate the temperature of the filament
A 400 g lemming (does anyone remember that old computer game?) waddles horizontally off a small 4.90 m high cliff with a speed of 0.5 ms-1.How far from the base of the cliff will the lemming land? What will be the lemmings speed upon landing.
An insulated Thermos contains 110cm3 of hot coffee at 90 °C. You put a 12g ice cube at its melting point to cool the coffee. By how many degrees has the coffee cooled once the ice has melted and equilibrium is reached? Care for the coffee as thoug..
Find the boundary layer thickness and drag on a given plate if Water at 15°C flows over a plate 2m long and 25cm wide at a velocity of 5 m/s along its length.
what time delay Delta t is necessary. A boxcar of mass 600 tons at rest becomes uncoupled on a 5.00 grade. If the track is considered to be frictionless, what speed does the boxcar have after 15 seconds.
Andy, age 16, lacks self-discipline, fails to plan ahead, and is rapidly frustrated by challenging tasks. He is nervous and overly critical of others. Make use of the psychoanalytic, humanistic and social-cognitive perspectives to give three contr..
Two 2.30 cm x 2.30 cm plates that form a parallel-plate capacitor are charged to +- 0.714nC. Part A What is the potential difference across the capacitor if the spacing between the plates is 1.00mm? Part B What is the potential difference across t..
The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.53 m and 1.03 m, respectively. The respective rotational speeds are 449 rev/min and 4147 rev/min. Compute the speeds of the tips of both rotors.
Three resistors are connected in series across a battery, What is the greatest voltage that the battery can have without one of the resistors burning up
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