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On a cold day, a heat pump absorbs heat from the outside air at 14°F (-10°C) and transfers it into a home at a temperature of 86°F (30°C). Determine the maximum COP of the heat pump.
Three vectors have the same magnitude of 18 units. They make angles of ?, 2 times ? and 3 times ? with respect to the x axis, where ? = 14 o. What is the y-component of their vector sum
A speedboat increases its speed uniformly from v1 = 20 m/s to vf = 25 m/s in a distance of 2.40 102 m. (a) Draw a coordinate system for this situation and label the relevant quantities, including vectors.
Two parallel plates are 6.0 cm apart. The bottom plate is charged positively and the top plate is charged negatively, What is the time required for an electron
The deflection in the moving coil galvanometer is reduced to half when it was shunted with a 40 ohm coil. The resistance of the galvanometer is what
Explain how would the results have differed in this experiment if the pulley and of the track was lower that the other end of the track?
one ball of mass 575 g traveling 3.50 m/s to the right collides with another ball of mass 425 g that is intially at rest. what is the velocity of the heavier ball
Two blocks hang from either end of a massless rope that runs over a pulley, treated as a thin solid disk, (An Atwood's Machine), and are held in place. Find the unknown mass of the block
a hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. estimate the length of the lake
A 44.5 mA current is carried by a uniformly wound air-core solenoid with 435 turns, a 20.0 mm diameter, and 14.5 cm length. Compute the magnetic flux through each turn
A resistor, capacitor and inductor are connected in series to an ac source with a frequency of 30 Hz and an rms potential of 40 V. What is the resonance frequency for this circuit
A particle has a charge of +2.3 ?C and moves from point A to point B, a distance of 0.13 m. The particle experiences a constant electric force, and its motion is along the line of action of the force.
A 50-g block of copper at -15?C is added to 100g of water in a 71-g aluminum cup. The cup and the water have an initial temperature of 4.0?C. Find the equilibrium temperature of the cup
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