Recent content by Lola Luck

I see, so when ## \vec{E} ## is constant there can't be any enclosed charge.

Sorry for the late response. If E is constant, that integral would equal the product (E)(area). So there's a positive flux, which implies that that region isn't uniform.

Sorry for the late response. I guess I didn't realize that if there's flux the field isn't uniform, but it makes sense. Thank you.

Homework Statement [/B] a) In a certain region of space, the volume charge density p has a uniform positive value. Can E be uniform in this region? Explain. b) Suppose that in this region of uniform positive p there is a "bubble" within which p=0. Can E be uniform within this bubble? Explain...

Fa is air resistance... I guess it's not necessary to include it. I think i have it figured out- thank you for your help!

ok it might be sideways but the top one is without leaning and the bottom one is with leaning

I can't show the free body diagram but i have the tension of the cable, gravity, air resistance, water resistance (friction?), normal force (buoyancy?). Is it because leaning back causes gravity to have a torque that counters the water resistance?

Oh yeah, completely forgot about gravity in the free body diagram...

by leaning back, apparently. is it because she shifts her center of gravity?

Air resistance acts across the front of the skier (equivalent to being concentrated at the center of mass), and water resistance, which exerts more force, acts along the skis. The tension acts along her arms, probably near the center of mass.

Homework Statement Why must a water skier moving with constant velocity lean backward? What determines how far back she must lean? Draw a free-body diagram for the water skier to justify your answers. Homework Equations Equilibrium: Fnet=0 and Torquenet=0 rcenter of...

This topic makes so much more sense now. Thank you for your help! :)

If the linear velocity is decreasing (it should be due to gravity), the rotational velocity also decreases. So static friction needs to act uphill to slow the ball down?

That it's accelerating? I'm not sure what you mean.

Ok, so how do I know it's uphill in this case? I think it's because gravity acts downhill and the force of static friction has to oppose gravity.