If you place an object with a mass of 613kg on an elevator that can generate up to 950 watts of power, what is the constant speed of the elevator lifting the object? (And of course, gravity is 9.8m/s squared)
If you pump water up 92 meters and um... it's going 75 L/s?... each liter has a mass of 1kg, then what is the power (I think? -- watts, anyway) to maintain that 75L/s thing?
Really sorry for being unclear, I had to attempt translating that. :/ Anyway, steps please. Thanks in advance!
2007-11-29 10:44:04 · 2 answers · asked by Ashley 2 in Science & Mathematics ➔ Physics
950 W means that you can change the potential energy of the 613-kg mass by 950 J each second.
950 = m g h
h = 950 / ( m g ) is thus the distance moved per second.
Moving 75 liters a height of 92 meters every second requires
( 75 ) ( 1 kg ) ( 92 ) ( 9.8 m/s^2 ) Joules per second (Watts)
2007-11-29 10:50:19 · answer #1 · answered by jgoulden 7 · 0⤊ 0⤋
1. about 0.15813829610147484768785164963212 m/s
2. 67620 watt
the steps :
1. power = energy/time
or
P=E/t
P=mgh/t
P=mg (h/t)
P=mgv
v=P/mg
v=950/613*9.8
2.note : p=density of water, V=volume of water
P=E/t
P=mgh/t
P=pVgh/t
P=pgh(V/t)
P=1*9.8*92*75
2007-11-29 18:59:28 · answer #2 · answered by superstring39 2 · 0⤊ 0⤋