Recent content by Retsam

Use potential energy formula : E = m*g*(change in height) E = 60*9.81*20 = 11772 J So skier loses 11772 J of potentiaql energy on descent, this is all converted into kinetic energy. So using KE formula : KE = 0.5*m*(v^2) V = sqrt(KE/0.5*m) = 19.81 m/s So add the initial...

Not quite, you only divided by a, when its supposed to be divide by 2*a And d is a distance so its measured in just m, m/s is for velocity

Nope that's wrong, rearrange it in these steps : (v2^2) = (v1^2)+2ad You want to clear everything off the right hand side to leave d on its own, so start by moving (v1^2) : (v2^2) - (v1^2) =2ad And now divide both sides by 2a, and so : (v2^2) -(v1^2) = 2ad ((v2^2) -(v1^2))/2a =...

Yea its same thing as you've put there, and as for the first question you would use, (v2^2) = (v1^2)+2ad and rearrange for d

Yea, try : V = u+at (V^2) = (u^2) + 2as s = ut + 0.5a(t^2) Where, u = initial velocity v = final velocity s = distance (or more correctly displacement) a = acceleration t = time

Using the equation : a = (v^2)/r Lets say the car is traveling at 70 mph and the radius of the turn is 2m. a = (31.11^2)/2 = 484 m/s^2 Or 50g, so yea its unlikely you would survive that lol

Yea and the speed of sound in a solid is actually depenadant on the material's youngs modulus by the equation : V = sqrt(Y/P) Where Y and P stand for the youngs modulus and the density respectively. The youngs modulus is the ratio between the stress and strain coefficients of the material.

No its not possible

Well it is the number of possible transitions that determine the number of spectrum lines you will see, and also the energy supplied to the atoms. If for example we imagine an atom has 3 energy levels, then the possible electron transitions would be : n3 => n1 5 J n3 => n2...

Best thing to do is just keep on with the school work and sit it out. Will take a while but eventually the wounds will heal, all you got to do is wait around long enough and it will happen. There is no other way past it I'm afraid.

If we imagine light coming from a single point at the bottom of the tank it will change direction as it moves from the water into the air, such that the angle of refration will be less than the angle of incidence and so to see this beam we would have to raise the camera. I'm nto sure if you can...

Well if you had a perfect faraday cage then no electric fields would be able to penetrate it, that is the reason mobile phones don't work in lifts. But if you don't cover two sides then there is going to be radio waves still entering your room. The metal shielding will absorb some of the waves...

I think we can just use the equation : PE = 0.5kx^2 Where k is just a constant, so first we must find k from our initial data : PE(2)/(x^2) = k 5.7(2)/(1.9^2) = k = 3.158 Now just use this value of k to solve the second part : PE = 0.5(3.158)(3.7^2) PE = 21.62 mJ ME = PE at...

V = 0 Vo = ? a = -6.5 t = ? d = 43 V^2 = (Vo^2) + 2ad V^2 - 2ad = Vo^2 (0)-(2)(-6.5)(43) = Vo^2 From there just squareroot to find Vo Questions are kind of easy if you follow the same process for each one, noting down the variables you know and which you don't know, and then...

Well you already know d for the dry road, what you need is d for the wet road, so : V = 0 Vo = 27 m/s a = -6.5 m/s2 t = ? d = ? so using V = Vo^2 + 2ad -(Vo^2)/2a = d -(27^2)/2(-6.5) = d = 56m