Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

An unruly demonstrator lifts a stone of mass 200gm from the ground and throws it at his opponent . At the time of projection , the stone is 150cm above the

ground and has a speed 3.0m/sec.Calculate the work done by the demonstrator during the process . If it takes one second for the demonstrator to lift the stone and throw ,whar is the horsepower does he use?


Potential energy= m*g*h /m- mass/g- gravity/h- height/ PE= 200mg*9.8m/s/s*150h =2.94 j Kinetic energy =0.5*m*v^2 /m- mass / v - speed / =0.5*200mg*900m/s=9kj= 0.9j Total energy = PE + KE = 2.94 + 0.9 = 3.84 j HP = TE/ 746 = 5.14*10^ -3
0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts