A 1000-W motor power a hoist used to lift cars at a service station. (a ) How much time would it take to raise a 1,200kg car 2m? (b ) If it is replaced with a 2,000W motor, how long would it take?
The energy required to raise the car is m*g*h = 1200*9.8*2 J. 1000W supplies 1000 J/s, so the time needed is 1200*9.8*2/1000 s The time for 2000 W is half that.
I actually have a point in physics, so with any luck i understand some factor. think of of of physics style algebra as purely algebra the situation the symbols have truthfully meaning. don't be disturbing of drawing diagrams to get the connection (a constraining equation) from the geometry. This many cases works good for rope style matters yet different too. yet extremely, the great factor is to think of of of physics as algebra the situation the symbols have truthfully values. F = ma is truthfully the comparable as y = mx + b the situation b = 0 in case you draw them on a graph you will see it extremely is the comparable. in spite of notwithstanding if it rather is likewise the case that F skill stress m skill mass a skill acceleration at the same time as y is any based variable x is any self sufficient variable m is the slope notice that once you plot F vs a the slope of the right this moment line going indoors the process the commencing place is the mass of the object. Its extremely all purely algebra, the techniques are the comparable, yet you're arranged to desire to concentration on the link from precis algebra to making algebra the situation the variables have truthfully meaning and then to concentration on how they suitable, like the mass being the slope subsequently.
