Recent content by LadyMario

Okay, so it travels 170 waves / s and one of the speakers is 1m further so it's out of phase by 170 waves (not sure how to get that into rads) but I feel like we need the speed of sound in there somewhere..

:confused: But we don't know the phase... I get that they're 1m apart and it covers 340 m every second so the phase would be out of sync by 1/340.. do I convert that to radians then?

I get that graphically a phase shift means it's literally shifted across the x-axis. But I can't think of an equation that would relate this an the distance.

An observer stands 3 m from speaker A and 4 m from speaker B. Both speakers, oscillating in phase, produce 170 Hz waves. The speed of sound in air is 340 m/s. What is the phase difference (in radians) between the waves from A and B at the observer’s location, point P? And I have no idea how...

Yea I found it in the textbook. We were never taught it in class, so I was trying to find another way to do it, but oh well :P

An 8000kg aluminum flagpole 100m long is heated by the sun from a temperature of 10°C to 20°C. Find the work done (in J) by the aluminum if the linear expansion coefficient is 24*10-6 /°C. (The density of aluminum is 2.7*103 kg/m3 and 1 atm = 1.0*105 N/m2) I know w=PΔV, and I know V at 10°C =...

I have the general idea, and I have drawn a diagram. I believe the formula is Xcm(M)=x1m1+x2m2+x3m3+x4m4 where M is the total mass and Xcm is the centre of mass in the x direction. But once I find this how do I get the moment of inertia for rotating around the x axis? Do I just use Xcm in the...

Homework Statement Four point masses form a rigid body (they are connected by massless rigid rods) given the positions M1= 3kg (2m, 4m, 0m) M2= 2kg (1m, -4m, 0m) M3= 1kg (10m, 2m, 0m) M4= 5kg (-5m, 2m, 0m) Find: A) Moment of inertia of this system when it rotates about x axis B) Moment of...

oh okay. I was thinking about how to get that equation, how do I get time and velocity though? From the Period equation: T=2piR/V but this time T= 1/15 and solve for V?

Yes I get that frequency means it will be 1/15 but what equation can I use to get tangential?

I was using T=2piR/V to get V and then using that in a=V^2/R but a friend pointed out the 15 rev/s is frequency, and so I'm not sure of an equation for that.

A wheel of 0.50 m radius rotates at 15 rev/s. What is the acceleration at its outer rim in m/s2 They want tangential acceleration right? Is there anyway to solve this without angular velocity/speed as we haven't learned that yet. This is part of the practice questions for my midterm on...

Two blocks connected by a rope of negligible mass are being dragged by a horizontal force F. Suppose that F=68 , m1=12kg, m2=18kg, and the coefficient of kinetic friction between each block and the surface is 0.100. Determine the tension, T, and the magnitude of the acceleration on the system...

Very much so! Thank you. I knew the answer; just couldn't explain why

You are pushing a wooden crate across the floor at a constant speed. You decide to turn the crate on end, reducing by half the surface area in contact with the floor. In new orientation, to push the same crate across the same floor with the same speed, the force that you apply must be about: A)...