Recent content by Lydia22

Homework Statement What are the strength and direction of an electric field that will balance the weight of a 1.0g plastic sphere that has been charged t0 -3nC ? Homework Equations E= F/q The Attempt at a Solution Newton's laws on the charged sphere ƩFnet(y) = F -mg=0...

Sorry i cannot use those fancy buttons.Thank you for the little light

If the velocity is final 'v' K =0.5M[V][/2] + 0.5I[ω][/2] + 0.5{2M}[V][/2] + mgh =0.5M[V][/2] + 0.5(0.005[V][/2][0.050][/2] + 0.5{2M}[V][/2] - 2(9.8)(0.090) + 0.5(200)(ΔS)

But how do I know i don't need to? won't this be in terms of unknowns ?? #swimming in the pool of confused (EXAM in a few hours) :cry:

If the velocity is final 'v' K =0.5M[V][/2] + 0.5I[ω][/2] + 0.5{2M}[V][/2] + mgh =0.5M[V][/2] + 0.5(0.5M[R][/2])[V][/2][R][/2] + 0.5{2M}[V][/2] - 2Mgh

I was trying to get the acceleration the lead to velocity

Homework Statement Two blocks, of masses M = 2.0 kg and 2M are connected to a spring of spring constant k = 200 N/m that has one end fixed, as shown in the figure below. The horizontal surface and the pulley are frictionless, and the pulley has a moment of inertia I=0.005 kg.m^2 with radius...

Homework Statement The 200g model rocket shown in figure 13.24 generates 4.0Nthrust. It spins in a horizontal circle at the end of a 100g rigid rod. what is its angular acceleration? http://s3.amazonaws.com/answer-board-image/c5d72a35f06dfbd77d87ba51ac9eaa51.jpg Homework EquationsThe Attempt...

yes it will have gravitational potential energy ,so do i add the radius of the marble to the height?

the height "h" is relative to the ground

gh = 7/10 [v]^2 [v]^2=10/7 gh v=√gR-r 10/7gh =g(R-r) h=10/7(R-r)

mgh= 1/2mv^2 + 2/5mr^2*v^2/r^2 gh=1/2v^2 +1/5v^2 h=1/10(v^2)/g At the top of the loop n+mg=mv^2 /r it just need the minimum velocity therefore the normal will be zero v=√gr h=1/10g The marble is rolling in a hoop

Homework Statement A marble rolls down a track and around a loop-the-loop of radius R. The marble has mass m and radius r. What minimum height h must the track have for the marble to make it around the loop-the-loop without falling off? Homework Equations mgh = 1/2mv^2 + 1/2Iw^2...

Chances are yes,but thanks for helping I will consult my lecturer.

so we have to include the kinetic energy at the top?