57 356
Assignments Done
99%
Successfully Done
In February 2018
Your physics homework can be a real challenge, and the due date can be really close — feel free to use our assistance and get the desired result.
Be sure that math assignments completed by our experts will be error-free and done according to your instructions specified in the submitted order form.
Our experts will gladly share their knowledge and help you with programming homework. Keep up with the world’s newest programming trends.

Answer on Mechanics | Relativity Question for Peter Giann

Question #3123
John and Janet were moving a heavy crate (with a mass M=250 kg) from their leveled driveway into their garage. Janet was pushing the crate horizontally with a force equal to 1/5 her weight. Her mass is 51 kg. John was pulling the crate with a 500N force at a 30 degree angle with the horizontal. The driveway and the wooden crate have a frictional forcve of 50.0N between them.

a.) total work done on the crate when it moved 45 m.
b.) It took 120 seconds to move the crate, calculate power.
Expert's answer
a) Work a=F*s, F=force, s- distance
Total work si& A=A(Janet)+A(John)-A(friction)
Hence we have
A=(51/5*9.81+500*cos(30)-50)*45=21738 Joules

b) Power P=A/t
Hence P=21738/120=181.2 Joules/s=181.2 Watt

Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be first!

Leave a comment

Ask Your question