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Air conditioners are rated by their coefficient of performance at 76^\circ{\rm F} inside temperature and 92^\circ{\rm F} outside temperature. An efficient but realistic air conditioner has a coefficient of performance of 3.2. What is the maximum possible coefficient of performance?
A uniform steel beam has a mass of 1860 kg. On it is resting half of an identical beam, What are the vertical support forces
Finally is the length is unchanged but the mass is equal to 0.500kg find the period T of the pendulum that is independent of the angle.
q1. a 653 kg lift starts from rest. it moves upward for 2.8 s with constant acceleration until it reaches a cruising
A ball of mass 522 g starts at rest and slides down a frictionless track. It leaves the track horizontally, striking the ground a distance of 1 m from the end of the track after falling the vertical distance 1.25 m from the end of the track.
Calculate this temperature.
A 20.0kg rock slides on a rough horizontal surface at 5.50 m/s and eventually stops due to friction. What average thermal power (Watts) is produced as the rock stops
The rifle fires a bullet with the speed 300m/s. The target is sitting on a tree 100m away from the shooter. What initial angle should be the rifle directed to hit a target
To protect their young in the nest, peregrine falcons will fly into birds of prey (such as ravens) at high speed. What was the raven's speed right after the collision
a sphere is constructed of two concentric pieces. The inner part is a solid sphere of radiu 10.0 cm made of a material with density 4000 kd/m^3. What is the average density of this sphere
Two capacitors have the same plate separation, but one has square plates and the other has circular plates, at is the dielectric constant kcircular of the material between the circular plate
An air-track glider attached to a spring oscillates between the 10.0 cm mark and the 65.0 cm mark on the track. determine the maximum speed of the glider
A rectangular coil with 20 windings carries a current of 1.87 mA flowing in the counterclockwise direction. What torque must be applied to the loop to hold it steady
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