500 cm3 of water is to be heated from room temperature (28°c) to 100°c In order to prepare hot cup of coffee What to the minimum heat required? How Long with It takes to heat the water with a 1000w heating coil which has a heating efficiency of 70% ?

Ahypothesis is? close agreement by competent observers of observations of the same phenomena. a guess that has been tested over and over again and always found to be true. an educated guess that has yet to be proven by experiment. the long side of a right triangle. a synthesis of a large collection of information that includes guesses.

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.

As the distance from a magnet increases, what happens to the magnet force?