Recent content by Rubidium

1. Homework Statement During a cold day, you can warm your hands by rubbing them together. Assume the coefficient of kinetic friction between your hands is 0.500, the normal force between your hands is 35.0 N, and that you rub them together at an average relative speed of 35.0 cm/s. (a) What...

got it...thanks!

I think the pressure would change but the volume remains constant in the box. Is the pressure given in the problem negligible or should I be able to use it?

How do I use all the information given in the problem to find that?

force exerted on walls of metal box...please help! 1. Homework Statement A cubic metal box that has 20-cm-long edges contains air at a pressure of 1.0 atm and a temperature of 300 K. The box is sealed so that the enclosed volume remains constant, and it is heated to a temperature of 400 K...

I have more information. I have molarity, mass, and momentum. What else do I need?

1. How can I relate the time it takes for a box of volume 8000 L to change temperatures from Ti=300K to Tf=400K? Homework Equations The Attempt at a Solution

1. Homework Statement A winch cable has a cross sectional area of 1.5 cm^2 and a length of 2.5 m. Young's modulus for the cable is 150 GN/m^2. A 950-kg engine block is hung from the end of the cable. (a) By what length does the cable stretch? (b) If we treat the cable as a piece of string...

I got the first part by using the trig identity and then taking the derivative, except I don't know why I had to take the derivative but it worked out anyway so I did. Now, if t=0 then that would make the sine portion of the position 0 and the cosine portion 1 so the initial position would equal...

1. Homework Statement (a) Show that A_{0}cos(\omegat+\delta) can be written as A_{s}sin(\omegat)+A_{c}cos(\omegat), and determine A_{s} and A_{c} in terms of A_{0} and \delta. (b) Relate A_{c} and A_{s} to the initial position and velocity of a particle undergoing simple harmonic motion...

1. Homework Statement Power transported by a wave problem...Please Help! 1. On a real string, some of the energy of a wave dissipates as the wave travels down the string. Such a situation can be described by a wave function whose amplitude A(x) depends on x: y=A(x)sin(kx-t), where A(x)=Ae...

I used the vertical conservation of momentum equation but I don't know how to use the horizontal momentum equation without knowing a1, a2, or either angle. Can you tell me more about that?

I also did find b2. I used the relation: 0=m1v1fsin(theta1)+m2v2fsin(theta2), and got b2=-0.9 m/s. But without either angle of deflection, a1, or a2 I am stuck from there.

That the kinetic energy of the system is the same before as it is after the collision.

Homework Statement The mass m1 has the velocity (v1i)\hat{i} and makes an off-center collision with m2=2m1. The final velocities are v1f=a1\hat{i}+b1\hat{j}, and v2f=a2\hat{i}+b2\hat{j}. Assuming elastic collision and v2i=0m/s, obtain the values of a1, a2, and b2 for the given value of b1...