Power is energy per unit time. So, the required power is 900/90 = 10 Watts.
Power is measured in watts, or joules per second. So in 90 seconds, 1200 joules of work is equal to 1200/90 watts or 13.3 watts.
The formula for energy. E is for energy(Units = Joules) P is for power(Units = Watts) T is for time(Units = Seconds)
The work is Work= FD= 40x18= 720 Joules. The power is W/seconds = 720/4= 180 Watts.
Although most of the time power is measured in Watts, it can also be expressed as Js-1. So in your question, you are given the amount of joules and the time in hours. First, convert 5 hours to seconds. There are 60 mins in an hour and 60 seconds in a minute. So that's going to be 5x60x60 = 18000 seconds Now all you do in divide the number of joules by the number of seconds to work out the power. So that's 7500/18000 = 0.41666666666... approximately, 0.42Js-1(2dp) and thats the same as 0.42W (2dp)
19 KW = 19,000 Joules per second.6.8 x 107 / 19,000 = 3,578.95 seconds, at the rate of 19 KW.That's 21.05 seconds short of 1 hour. In exactly 1 full hour, the engine delivers 6.84 x 107 joules.
7.5 watts
Work done (joules) and time taken (seconds) is the information needed to calculate power in watts (joules/second).
18 Seconds (:
Power is measured in watts, or joules per second. So in 90 seconds, 1200 joules of work is equal to 1200/90 watts or 13.3 watts.
Power = Work / time= 600 J / 150 secPower = 4 J/s or 4 Watts (1 Watt = 1 J/s)
That is called "power". Energy / time = powerIn SI units: Joules / seconds = WattsThat is called "power". Energy / time = powerIn SI units: Joules / seconds = WattsThat is called "power". Energy / time = powerIn SI units: Joules / seconds = WattsThat is called "power". Energy / time = powerIn SI units: Joules / seconds = Watts
60,000 joules per 10 seconds = 6,000 joules per second = 6,000 watts
Watts is joules per second, so 50 joules in 5 seconds is 10 watts.
480 joules = 480 watt-seconds20 watts x (time) = 480 watt-secondsDivide each side by 20 watts:Time = 24 seconds
6000 joules / 70 seconds = 85.71 watts
1800 joules / 1 minute = 1,800 joules / 60 seconds = 30 joules per second = 30 watts.
Power = energy/time During those 25 seconds, the machine is doing work at the rate of 800/25 = 32 watts. We don't know how much power the machine must consume in order to perform work at that rate, but we know it's more than 32 watts.