Recent content by cjavier

Homework Statement A parallel-plate capacitor of capacitance C with circular plates is charged by a constant current I. The radius a of the plates is much larger than the distance d between them, so fringing effects are negligible. Calculate B(r), the magnitude of the magnetic field inside the...

Suppose two loudspeakers are separated by three meters and are being driven by exactly the same sinusoidal signal at a frequency that can be varied. If you are located four meters away directly in front of one of the speakers, determine three lowest frequencies for which you would hear...

I'm confused if this is an actual question or one that is supposed to make me think. The differential equation for the motion of a pendulum is Id2θ/dt2

The physical pendulum is an object suspended from some point a distance d from its center of mass. If its moment of inertia about the center of mass is given by: I= Icm + Md2 where d is the distance from the pivot to the center of mass of the pendulum. Consider that some odd-shaped physical...

Static friction, and yes I did, thank you

So I feel as though I have the correct solution, but am not positive. My problem is as follows: A block of mass M is at rest with respect to a surface which oscillates horizontally with sinusoidal motion described by the equation x(t)=Asin(ωt). Find an expression for the minimum value of the...

The problem is: The two blocks in the figure are connected by a massless rope that passes over a pulley. The pulley is 12cm in diameter and has a mass of 2kg. As the pulley turns, friction at the axle exerts a torque of magnitude 0.5Nm. If the blocks are released from rest, how long does it take...

I'm not quite sure what I am supposed to get. I get T/ma + T/mb= -gcos(30) [I substituted μka with 2 and μkb with 1 for simplicity]

The question: Two packages have just started sliding down a ramp that forms an angle of 30 degrees with the horizontal. They are connected with a rope. Package A is 6m up along the ramp, with a mass of 4 kg and a coefficient of kinetic friction of 0.3. Package B is directly above 4 m further up...

The two blocks in the figure are connected by a massless rope that passes over a pulley. The pulley is 12cm in diameter and has a mass of 2kg. As the pulley turns, friction at the axle exerts a torque of magnitude 0.5Nm. If the blocks are released from rest, how long does it take the 4 kg block...

In the attached picture, one sees a pulley with a mass which is holding two different weights. In chegg, the tension due to a weight is represented as a downward direction. Then, when the tension is seen in relation to the pulley, the direction switches for both weights. WHY IS THIS...

In the attached picture, one sees a pulley with a mass which is holding two different weights. In chegg, the tension due to a weight is represented as a downward direction. Then, when the tension is working on the pulley, the directions switch. WHY IS THIS?! Thanks, Cameron

So...I have two different homework problems. I'm not asking for answers to these problems! Just clarification. In problem one I am asked: A thin disk with diameter d rotates about an axis through its center with 0.260J of kinetic energy.What is the speed of a point on the rim? I use E = 1/2Iω2...

Question Resolved HORIZONTAL. I see now. Thank you

The Question Is: The 200 g model rocket shown in the figure generates 4.0 N of thrust. It spins in a horizontal circle at the end of a 100 g rigid rod. What is its angular acceleration? Here is the picture: http://session.masteringphysics.com/problemAsset/1073775/3/knight_Figure_13_24.jpg...