How much work is done on a 200-kg crate that is hoisted 2 m in a time of 4 s?a. 400 Jb. 1000 Jc. 1600 Jd. 4000 JPlease, explain your answerThank you
OK now for the easy answer. Sir Issac Newton figured out when an object was dropped it would accelerate at a rate of 9.8 meters per second, which is usually rounded up to 10 m/s, until it was stopped by another object which is usually the earth this is called a Newton. Any time you are working against gravity on Earth it is 10 m/s. So now we will use a very easy formula to get the Work or Joules of this Problem. Work(Joules) = Mass(Kg) x Newton(10 m/s) x Distance(m) So to solve this problem it is Mass(200kg) x Newton (10 m/s) = 2000 Newtons x Distance (2m) = Work (4000 Joules) If this problem would have said Power instead of Work than you would now want to get the Watts for this problem the formula is Energy = Work (Joules) divided by Time (seconds) so Work (4000 Joules) divided by Time (4 seconds) = Energy (1000 Watts)
D-4000 j . If mass=200kg accleraion=10m/s displacement=4m than W=mgs time is of no consideration
On earth, working against gravity - you did say hoisted, which I'm assuming is a direct vertical movement, is mgh or (200)(9.81)(2) =~ 3924 J d It's slightly a trick question. The amount of work has nothing to do with time; that would be power, which is watts, or joules per second.
