Recent content by KatlynEdwards

Oh, I was under the impression that the acceleration vector was parallel to the change in velocity vector, is this false?

Homework Statement An object moves clockwise with decreasing speed around an oval track. There are velocity vectors at two points (G and H). G has a greater speed than H. Is the angle between the acceleration and velocity vector of G greater than, less than, or equal to 90 degrees...

Homework Statement A 7 kg bowling ball whose radius is 0.13 m is rolling directly toward you turning three times per second. What are the magnitude and direction of its rotational angular momentum about you? What is its translational angular momentum about you? Homework Equations L = r x...

Well, ΔP = m*g*Δh = m*g*(hf - hi ΔK = 1/2 m*v^2 = 1/2 m*vf^2 So basically ΔP and ΔK are opposites?

Well if they want the change in potential and kinetic energy of the system, I would have to say zero because of the fact that there is no external work. So would I say: ΔK + ΔP = External Work 0 + 0 = 0 ?if the system was just the ball, instead of the ball and the earth, my first two answers...

Homework Statement A ball of mass m falls from height hi to height hf near the surface of the Earth. When the ball passes hf it has speed vf. Ignore air resistance, and assume that any changes in kinetic energy of the Earth are negligible. Also, the starting velocity of the ball is zero...

Okay, so then in experiment 1, the work is zero because the work on block one cancels out the work on block two due to the opposing directions. In experiment 2 the work is greater than 1 because there are two positive works being added together. In experiment three, the work is still...

Homework Statement In experiment 1, two hands push identical blocks of mas m toward each other across a level frictionless surface with a constant force of magnitude F over the interval from t1 to t2. In each experiment both blocks start from rest at time t1 on a level frictionless...

Homework Statement If a vector "u" is added to a vector "w", under what circumstances will the value of mag(u+w) ever be greater than mag(u)+mag(w)? Homework Equations Magnitude = Sqrt( (Sum of x components)^2 + (sum of y components)^2 )The Attempt at a Solution I really, have no idea where...

Homework Statement Neutrinos very rarely interact with anything and thus are very hard to detect. About 10^14 neutrinos from the sun pass through your body every second, even at midnight (the neutrinos easily go through the earth), but this is of no concern since only one a day interacts...

Okay so I figured out the first part, and the second part (1.936) but now I'm stuck on the third part - finding the initial speed. I know that I should use v(t)=-vmax*sin(2*pi*frequency*t) but we don't know t. And a t of zero gives me an answer of zero...

Yeah you were right. The spring constant was in fact labeled in the picture xD. I feel rather stupid now, especially since that was the only thing wrong :P. Oh well. Lesson learned - look at ALL the information. Haha. Thanks for the help!

How is K given in the picture? Am I missing something? Which is totally possible. Is the 20 N/m the spring constant?

Homework Statement The figure shows a block on a frictionless surface attached to a spring. The block is pulled out to position x_i = 20 cm, then given a "kick" so that it moves to the right with speed v_i. The block then oscillates with an amplitude of 44 cm. Image of the problem -...

Op never mind, I needed to change kJ into Joules, then it gives me time in seconds. Whoops. :D