Qualification > Sciences

Edexcel physics question??

<< < (2/3) > >>

astarmathsandphysics:
force=rate of change of momentum
800000=60000*v
v=800000/60000=13.3m/s
P=Fv=800000*20=1600000W
water gains KE at rate1/2mv^2=1/2*60000*13.333^2=5333333W
effieciency=useful energy out/useful energy in
=(5333333+16000000)/(1.6*34000000)=21333333/54400000=0.4

Igcseboy:
so it was related with momentum????

because i dnt have tht in my sylabus@!!!!

astarmathsandphysics:
F=ma is in your syllbus - ma is rate of change of momentum

dlehddud:

--- Quote from: The Mysterious Dude on May 04, 2010, 10:12:25 am ---Sorry, I only do AS Physics, I dont know how to solve that question....

--- End quote ---

Wot board are you doing? Cos I do AS Physics, and that's quite a common question.. And @Igcseboy, it's newton's second law of motion- the rate of change of momentum of a body is proportional to the resultant force on the body, and acts in the direction of the force.

Igcseboy:
ya ya i got it got confused but now am good

Navigation

[0] Message Index

[#] Next page

[*] Previous page