# Search results

1. ### Charge moves through a circuit element and loses energy

Homework Statement If +6 (C) charge moves through a circuit element, and in so doing the charge loses 12 (J) of energy, then what is the magnitude of the voltage across this circuit element? A)2(V) B)6(V) C)12(V) D)72(V) For the same circuit element and situation described in question 1, is...
2. ### Spinning spokes and clay

is it a rod? My homework is due at 8pm..
3. ### Spinning spokes and clay

Is the first part right with a) and e) being true? and also what do i do for #2 instead?
4. ### Spinning spokes and clay

Homework Statement A device consists of eight balls each of mass 0.78kg attached to the ends of low-mass spokes of length 2.2m, so that the radius of rotation of the balls is 1.1m. The device is mounted in the vertical plane. The axle is held up by supports that are not shown, and the wheel is...
5. ### A ball of mass m is thrown with a velocity v at a disk

Am I correct?
6. ### What is the direction of the red ball's angular momentum

The answer was out of the page, thanks everyone.
7. ### A ball of mass m is thrown with a velocity v at a disk

Homework Statement A ball of mass m is thrown with a velocity v at a disk of mass M which sticks to the rim on impact. https://s3.lite.msu.edu/res/msu/perl_author/P3_PRELECTURE/L_CONSERVATION/IMAGES/CQ1.png For the system of the ball and disk, what is the total initial angular momentum...
8. ### What is the direction of the red ball's angular momentum

So who is right here? I only have one try
9. ### What is the direction of the red ball's angular momentum

It would be going out of the page then!?!?!? because it will be pointing upwards
10. ### What is the direction of the red ball's angular momentum

Vector C will be perpendicular to both A & B. The angle will be between 0 and 180 degrees A x B = A B sin([PLAIN]https://www.physics.uoguelph.ca/tutorials/torque/theta.gif) [Broken] not familiar with right hand rule but I'm trying to learn it right now
11. ### What is the direction of the red ball's angular momentum

it is 180 degrees, I'm still a little lost of what the answer could be though..
12. ### What is the direction of the red ball's angular momentum

Opposite to the momentum?
13. ### What is the direction of the red ball's angular momentum

Cross product is r⃗A × F⃗ This helps you find torque
14. ### What is the direction of the red ball's angular momentum

L = r x p L = same as momentum then ?
15. ### What is the direction of the red ball's angular momentum

Unfortunately that info is not given, but if we assumed it was down wouldn't the answer just be same as momentum?
16. ### What is the direction of the red ball's angular momentum

Homework Statement What is the direction of the red ball's angular momentum about the point A? (see figure) Same as the momentum. Out of the page. Zero magnitude. Opposite to the momentum. Same as rA. Into the page. [/B] Homework Equations Angular Momentum[/B] The Attempt at a...
17. ### Car and truck collide

Larger, I mean the energy from the collision is so much larger than the road.
18. ### Car and truck collide

The collision is so short that you can just neglect the road? And because the road will have such a tiny affect since the collision is so much larger?
19. ### Car and truck collide

Im honestly kinda lost here, it it because the collision is between the car and truck, so the system is the car and truck, making the road be neglected?
20. ### Car and truck collide

Homework Statement What is the x-component of the velocity of the stuck-together car and truck just after the collision? speed= -7.32352941176471 m/s You are correct. c) In your analysis in part (b), why can you neglect the effect of the force of the road on the car and truck? Homework...
21. ### Block and the bullet

(m+M)gh+ksh=1/2(m+M)V^2 the spring constant should be 1/2ksh^2 not ksh (m+M)gh+1/2ksh^2=1/2(m+M)V^2 (m+M)v+ksh=(m+M)V Ugrav should be (m+M)gh instead of velocity multiplying the masses (m+M)v, also (m+M)V is missing V^2
22. ### Block and the bullet

1/2ks(s^2 final - s^2 initial) ks = spring constant (k_s_) (s^2 final - s^2 initial) = final stretch - initial stretch v= velocity m=mass1 M=mass2
23. ### Block and the bullet

Because the other two equations are missing components to their equations
24. ### Block and the bullet

Homework Statement Which equation could adequately be used to determine how high the block goes after being hit by the bullet (a height h)? (see figure) (m+M)gh+ksh=1/2(m+M)V^2 (m+M)gh+1/2ksh^2=1/2(m+M)V^2 (m+M)v+ksh=(m+M)V Homework Equations KE=1/2mv^2 Ugrav=Mgh PE of spring =...
25. ### Thomson and Rutherford's experiments

That is what I tried and it was wrong :(
26. ### Thomson and Rutherford's experiments

Homework Statement If Thomson's "plum pudding" model was correct, what could have happened when Rutherford fired high energy alpha particles at gold foil? Select all that are True. Alpha particles are reflected. Alpha particles pass right through with no deflection. Alpha particles...
27. ### Momentum of two carts

Case (i) is non zero and Case (ii) is zero ?
28. ### Momentum of two carts

So you're saying we don't know if the momentum is zero or nonzero so I'm wrong?
29. ### Momentum of two carts

Homework Statement Two identical carts A and B roll down a hill and collide as shown in the figure below. i) A starts from rest. It rolls down and collides head-on with B which is initially at rest on the ground. The two carts stick together. ii) A and B are at rest on opposite sides of the...
30. ### Is it a good idea to fire a shotgun against a tree?

It would move more, resulting in a big mistake. I really liked the example you used, made it very easy to think through the concept, thank you.