A crane lifts a 487kg beam vertically at a constant velocityIf the crane does 5.20 times 10^4 J of work on the beam, find the vertical distance that it lifted the beam.
If you mean on top of burners that you are Not using to keep them clean when you are using the others- that is fineI keep one of the large elements that I seldom used covered with Aluminum foil most of the time BUT if you mean can you put it on burners while you use them, the answer is noIn any case the aluminum wouldn't stand up to itAnd spills would give you even more smoke in that case because nothing would go through-in turn tempting you to try to remove the aluminum from a hot burner- a recipe for disaster.
It is not safe to use foil around the drip pan of an electric stove elementOne, for all the reasons mentioned aboveSecondfoil is metaland conducts electricityIf the foil gets down next to where the elements connect inside the stove topAnd the foil comes in contact with both element connectionsYou just created a short circuit!! This can spark, cause electrocution, pop a circuit breaker/ or fuse, start a fire with grease in the foil.etcPans are metal tooBut they cannot come in contact with the element connections, because they stay on top of the elementAlso, if the electric cooking element looks worn, chipped, charredReplace itBecause this too can become an electrical problemSo do not use foil on an electric stove.
Mechanical work is the amount of energy transferred by a force acting through a distance: W F d d W/F W/(m g) 5.20 10^4 / (487 9,8) 10,90 m Regards
No, it is not safe, and no, it is not effectiveIf you put aluminum foil on top of the element it will simply burn when you turn the element onSo you won't have achieved anythingYou can buy burner bibs that fit over the bibs under your burners, and these can be taken out at intervals and popped in the dishwasher so it's easier to keep them clean and not set off the smoke alarm.
