Recent content by chinnie15

Ohhh, ok. I think I get it now (points a, c, and e are constantly flipping between constructive interference up top or at the bottom, while points b and d are never constructive). Thank you so much!

Homework Statement Two speakers are emitting identical sound waves with a wavelength of 4.0 m. The speakers are 8.0 m apart, directed toward each other. At each of the noted points (a-e) in the above diagram (at 2,3,4,5, and 6 meters, respectively), is the interference constructive...

Ohh, ok, I got it now, thanks! :) I wasn't even thinking about that. Like haruspex said, I thought it was 30 degrees because I thought that's what it was referring to. @ haruspex: The force is to the right. And the displacement of the box is to the right. So, the angle between them must be...

I'm sorry, I really don't know. What angle between the force and displacement? I thought that was the 30 degrees.

Homework Statement Suppose you lift a 23kg box by a height of 1.0m. How much work do you do in lifting the box? 230 J Instead of lifting the box straight up, suppose you push it up a 1.0 -high ramp that makes a 30 degree angle with the horizontal. Being clever, you choose a ramp with no...

Thank you! I got it now!

Ok, for 'T' I ended up calculating 5.48x109K. After plugging everything in, I am getting the answer of 543W, but it's telling me it's wrong? What could I still be doing wrong?

Oh geez, can't believe I did that. Thanks! So, the equation I need is: Q/Δt=eσAT4 Area, I found out is 1.8m2, e is .97, and σ is 5.67x10-8W/m2K4 My question is... what is T? Is it the temperature of the surroundings? Of the skin? It doesn't say delta T, so I am assuming it's one or the...

Homework Statement If you lie on the ground at night with no cover, you get cold rather quickly. Much of this is due to energy loss by radiation. At night in a dry climate, the temperature of the sky can drop to -40°C. If you are lying on the ground with thin clothing that provides little...

Ohh, ok. I got it now, thanks! :) The answer is -70C.

Homework Statement An ideal gas is at 40°C. The gas is cooled, reducing the thermal energy by 35%. What is the new temperature in °C?Homework Equations I'm not sure there is one? The Attempt at a Solution Since, in an ideal gas, thermal energy is proportional to temperature, I multiplied 40°C...

V changes at a constant rate of 1.6 m/s2. And the peak of the parabola is (1.3s, 1.3m)?

Ok, got it! ax=1.6m/s2, vxi= -2 m/s, and xi=2.5m

Xf=xi+(vx)iΔt+(1/2ax)(Δt)2 So.. this one?

Oooh, motion at constant acceleration?