Recent content by TheKovac

Homework Statement A coil of radious 4cm has its plane perpendictular to a uniform magnetic field of strenght 2 mT directed into the page as in the following diagram http://i83.photobucket.com/albums/j283/cowsgomoo47/physics_prob_magnetism.jpg The magnetic field is then switched off is...

So therefore, the equation for the pivot and the torque would be: T(robin) = T(chris) (2* (9.8*80) - (1*(9.8*50) = r IS that Right?

So I figure these are the following forces. (see diagram) Therefore, I believe I should create my equation based upon the middle force, right at the edge of the support - is that correct?

Well I believe there are two force in an upward direction, and then one force of Weight going in a downward direction. Am I right? So the next step for me, is to work out the two opposing forces?

Homework Statement Chris and Robin use a 3m, 40kg, plank to span 2m over a river. The plank is set up with 1.0m on the bank and Robin is standing so that her centre of mass is 0.2m from the end. The diagram attached shows Chris (50kg) walking out on the plank. Robin has a mass of 80kg...

Homework Statement A bicycles accelerates from rest, covering 16 metres in 4 seconds. The total mass of the bicycle and its rider it 90kg. What is its average acceleration during this time? Homework Equations x = ut + 0.5at^2 v=xt a=vt The Attempt at a Solution v = x/t v = (16)/(4)...

THANK YOU VERY MUCH FOR YOUR HELP! You helped me solve this issue. Can you believe I made such a small mistake - Ridiculous! I really do appreciate your help. I think I need to think and take more care with my work! :) Kindest Regards, TheKovac

Satellite Motion / Universal Gravitation - This doesn't seem right... Homework Statement How far is a 1Kg / 10N wieght, from the Earth's surface, when it is 5N? Homework Equations g= GM/r^2 W=mg The Attempt at a Solution => W=mg => 5=1g g = 5 g= GM/r^2 =>5 =...

THANK YOU TO ALL WHO ASSISTED WITH MY PROBLEM! The matter is solved, and I am very happy with all the kind hearted assistance I received. Have a great afternoon. Kindest Regards, TheKovac

Thank you very much for your answer, you really have got me thinking now. Does that mean: F=ma F= 400*9.8 Fnet = 3920N centripetal Force = 1440 =>Fnet - Fc => 3920 - 1440 F= 2500N Am I correct?

Circular motion - Please help, I think the book's wrong!? Homework Statement A car of mass 400kg travels over a bump of radius 10m on a track in a fun park. a) What force is exerted by the track on the car when it travels over the top of the hump at a speed of 6 m/s. b) What is the...

Homework Statement A object is projected with a velocity of 100 m/s at an elevations 30 degrees from a tower 150m high. a) Time of flight b) The horizontal distance from the tower at which the stone strikes that ground. c) The magnitude and the direction of the velocity of the stone...

So with that in mind, is this how to work the difference? If the velocity is constant, then can we use t = x/v ? t(parachutist)= 50/12 t(parachutisit)= 4.16 t(coin) = 2.16s t(difference) = 2s I think this one is right? I worked out that my problem above, is that I used the equation for...

Velocity = Vector quantity of the rate of change of displacement. So I am missing direction? Thats it?

My goodness, could be as simple as: t= x/a => t= 50/9.8 Which would result in: t= 4.16s => t(coin)= 2.16s => t(parachute) = 4.16s t(difference) = 2s Is that how simple the answer is?