# 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

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...
3. ### 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...
4. ### 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...
5. ### 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...
6. ### 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 =...
7. ### 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...
8. ### 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...
9. ### Is it a good idea to fire a shotgun against a tree?

Homework Statement [/B] When Danny was 13, he went deer hunting with his grandfather. He decided that he didn't like the "kick" of the gun, so he pressed himself against a tree before firing a 12-gauge (3.5kg) loaded with a deer slug (0.22kg). Evaluate this idea. It was a big mistake. It...
10. ### String wrapped around a disk

Homework Statement A string is wrapped around a disk of mass 2.1kg and radius 0.045m. Starting from rest, you pull the string with a constant force of 13N along a nearly frictionless surface. At the instant when the center of the disk has moved a distance 0.13m, your hand has moved a distance...
11. ### A two mass and spring system

Homework Statement Two identical 0.25kg blocks (labeled 1 and 2) are initially at rest on a nearly frictionless surface, connected by an unstretched spring, as shown in the upper diagram, where x2=0.059m. Then a constant force of 17N to the right is applied to block 2, and at a later time the...
12. ### Three Particle System

Homework Statement Consider a system consisting of three particles: m1=5kg, v1=-6,6,7ms m2=7kg, v2=8,-6,-7ms m3=1kg, v3=6,7,13ms What is the total momentum of this system? What is the velocity of the center of mass of this system?[/B] Homework Equations p=m*v The Attempt at a Solution...
13. ### Hemisphere center of mass

Homework Statement Consider a solid hemisphere of uniform density with radius R. Where is the center of mass? z=0 0zR2 z=R2 R2zr z=R Image is provided. Homework Equations None The Attempt at a Solution Answer A and E do not seem logical. I thought it was answer C from my eyes...
14. ### Change in thermal energy

Homework Statement A block of mass M is pulled at constant speed with force F a distance d across a surface. Using the energy principle, what can you say about the change in thermal energy of the block? a)...
15. ### Spring Maximum Length

Homework Statement A mass of 0.36kg hangs motionless from a vertical spring whose length is 0.8m and whose unstretched length is 0.51m. Next, the mass is pulled down to where the spring has a length of 1.09m and given an initial speed upwards of...
16. ### Determine the compression of the spring

Homework Statement Russian aviator Vsevolod Mikhailovich Abramovich invented the Abramovich Flyer based on the design of the Wright brothers' first plane. After this first success, Abramovich became obsessed with deep space travel designing a spring based launcher to fire a probe of mass 90kg...
17. ### Gravitational Potential Energy Question

Homework Statement [/B] Calculate the gravitational potential energy of the interacting pair of the Earth and a 23kg block sitting on the surface of the Earth. You would need to supply the absolute value of this result to move the block to a location very far from the Earth (actually, you...
18. ### Comet orbiting a Star - True and False

Homework Statement Consider the path of a comet orbiting a star, the system of the comet plus the star. Which of the following statements are correct? Select all that are True. 1) As the comet slows down, the kinetic energy of the system decreases. 2) As the comet's kinetic energy increases...
19. ### Which describes the 1D gravitational force in this figure?

Homework Statement [/B] 1)Which describes the 1D gravitational force in this figure. (+x is to the right.) a)Something else. b)Fgrav=−GMmx2 c)Fgrav=+GMmx2 2)In moving the little mass m from x1 to infinity the force of gravity does _____________ work. a) positive b) negative c) no I added...
20. ### Force between polar molecule and an ion

Homework Statement Under certain conditions the interaction between a "polar" molecule such as HCl located at the origin and an ion located along the x axis can be described by a potential energy U=−bhttps://s3.lite.msu.edu/adm/jsMath/fonts/cmmi10/alpha/144/char3D.pngx^2, [Broken] where b is a...
21. ### What is mass of particle X before the decay?

Homework Statement Professor X, a nuclear physicist who works at the MSU FRIB facility, has designed a new particle detector called The da Vinci Decoder. Using this detector, she has discovered a new particle dubbed particle X that violates lepton number conservation. A stationary X is observed...
22. ### Magnitude of velocity and impulse

In one of MSU’s seven sacks, MSU linebacker Denicos Allen sacked UM quarterback Devin Gardner. Just prior to being sacked, the quarterback was at rest. Just after they collided, the two players were momentarily stuck together and both slide a distance of 1.5 m before coming to a stop. In...
23. ### Which person exerted a force perpendicular to displacement?

Homework Statement Jack and Jill are maneuvering a 3570kg boat near a dock. Initially the boat's position is https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char68.png2,0,9https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char69.pngm [Broken] and its speed is...
24. ### What is the final speed of the boat?

Homework Statement Jack and Jill are maneuvering a 3570kg boat near a dock. Initially the boat's position is https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char68.png2,0,9https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char69.pngm [Broken] and its speed is...
25. ### Final Speed Question

Homework Statement An object with mass 161kg moved in outer space. When it was at a location https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char68.png7,-17,-9https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char69.pngm [Broken] its speed was...
26. ### K=1/2mv^2 simple physics question

Homework Statement A ball whose mass is 8kg travels at a velocity...
27. ### Is the ball's speed increasing?

Homework Statement The figure below shows a moving ball, its momentum, and the net force acting on it an instant in time. At this instant, the ball's speed is: 1) not changing [/B] 2) decreasing 3) increasing Homework Equations None. The Attempt at a Solution My guess would be that the...
28. ### Inelastic collision problem

A bullet is fired directly into a wood block (along the x-axis), which rests on a rough table. The bullet embeds itself in the block. (This is an inelastic collision: the block deforms and the block and bullet heat up as a result of the collision). a) If the bullet has a mass 0.049kg and is...
29. ### Box coming to a stop on a ramp

Homework Statement You are helping your friend move, using a ramp to move boxes from the ground to the moving truck. You give a 26kg box a shove so it moves at 1.4mhttps://s3.lite.msu.edu/adm/jsMath/fonts/cmmi10/alpha/144/char3D.pngs [Broken] at the bottom of the ramp. The angle that the ramp...
30. ### Young's modulus of a hanging wire

Homework Statement A hanging wire made of an alloy of titanium with diameter 0.5cm is initially 6m long. When a 60kg mass is hung from it, the wire stretches an amount 1.44cm. A mole of titanium has a mass of 48g, and its density is...