A - How much does the barrel weight?
B - How much work was done?
C - If the person exerted an effort force of 250 Newtons to roll the barrel along the ramp, what is the efficiency of the ramp?
10 Points for Best Answer.
2006-08-12 14:27:31 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Physics
A) the weight of the barrel is mass x acceleration due to gravity. W = 40 x 9.8 =392 newton.
B) Work done is Force ( weight) x distance moved in the direction of force. W x h = 392 x 5 = 1960 joule.
C) Work done by the 250 newton force is the Force x distance moved in the direction of force. 250 x 10 = 2500 joule.
Work actually needed is only 1960 joule.
Efficiency is ratio of work actually needed to the work done by us.
Efficiency = 1960/ 2500 = 0.784 = 78%.
2006-08-12 15:47:35 · answer #1 · answered by Pearlsawme 7 · 2⤊ 0⤋
A 40 kg.
B 40 kg. times 9.81m/s/s times 5 metres= 1962 joules.
C 200/250=0.8.
2006-08-12 21:48:06 · answer #2 · answered by zee_prime 6 · 0⤊ 2⤋