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An air conditioner is used to keep the interior of a house at a temperature of 25C while the outside temperature is 34C
a) If heat leaks into the house at the rate of 11kW, and the air conditioner has the efficiency of a Carnot engine, what is the mechanical power required to keep the house cool?
A long, current-carrying solenoid with an air core has 1640 turns per meter of length and a radius of 0.0173 m. What is the mutual inductance of this system
The volume control on a surround-sound amplifier is adjusted so the sound intensity level at the listening position increases from 21 to 59 dB. What is the ratio of the final sound intensity to the original sound intensity?
How much work did movers do (horizontally) pushing a 150-{rm kg} crate 10.6 m across a rough floor without acceleration, if the effective coefficient of friction was 0.50.
The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3. Explain how high does the top of the ice block float above the water level?
A tuning fork is sounded above a resonating tube (one end closed) which resonates at a length of 0.32 m, What is the frequency of the fork
A 60 kg person drops from rest a distance of 1.20m to a platform of negligible mass supported by a stiff spring. The platform drops 6cm before the person comes to rest.
You pull a 12 kg sled across the floor with a strap that is at an angle of 31° above the horizontal with a force 76 N. Determine the magnitude of the acceleration of the sled, given that the coefficient of kinetic friction between the suitcase an..
assume the film show in the figure has an index of refraction of 1.36 and is surrounded by air on both sides.
The two surfaces of a plastic converging lens have equal radii of curvature of 24.5cm, determine the index of refraction of the plastic
A flight attendant pulls her 71 N flight bag a distance of 322 m along a level airport floor at a constant velocity. The force she exerts is 36 N at an angle of 53° above the horizontal.
An 8.0g bullet is shot into a 5.0kg block, at rest on a frictionless horizontal surface. Find the speed of the bullet
A .228g wires are stretched between two points 77.20 cm apart. The tension in the wire is 618N. Find the frequency of the first harmonic. Reply in units of Hz.
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