How many lemons and limes can buy for given price
At the local grocery store, lemons are 52 cents each and limes are 21 cents each. How many lemons and limes can you buy for exactly $3.75?
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What is the maximum possible coefficient of performance of a heat pump that brings energy from outdoors at -13.00°C into a 22.0°C house? Note that the work done to run the heat pump is also available to warm up the house.
An electromagnetic wave strikes a 2.40-cm2 section of wall perpendicularly. The rms value of the wave's magnetic field is determined to be 7.60 10-4 T. How long does it take for the wave to deliver 2350 J of energy to the wall?
Nuala drives to her grandma's. She drives at 20 miles per hour. The journey takes 50 minutes. How long would the journey take if Nuala drove at 40 miles per hour?
If the heat pump is reversed so that it acts as an air conditioner in the summer, what would be its coefficient of performance?
Write an equation that models the amount of water (w) in the tank for any hour (h) that the machines are on. The tank starts full with 150 gallons of water in it.
The circuit is initially uncharged. It is the allowed to charge. It is then left hooked up to the battery for a long time. Then it is allowed to discharge completely. What is the value of the time constant?
What is the least number of packs of each he should order to so that each scout will have 1 hat and 1 shirt, and none will be left over?
A 30-turn 11.5 cm diameter coil is placed between the pole pieces of an electromagnet. When the magnet is turned on, the flux through the coil changes, inducing an emf.
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