# Search results

1. ### Kinetic and Potential Energy?

There is a graph of the distance and potential energy. When the problem states that it is 4cm from its equilibrium position, is it referring to the x or y component?
2. ### Kinetic and Potential Energy?

Kinetic and Potential Energy!?! This problem is totally confusing me..can someone please explain it...:confused: A 3.0 kg object subject to a restoring force F is undergoing simple harmonic motion with a small amplitude. The potential energy U of the object as a function of distance x from...
3. ### Work/Spring problem

The exact problem is: A massless spring is between a 1-kilogram mass and a 3-kilogram mass, but it is not attached to either mass. Both masses are on a horizontal frictionless table. In an experiment, the 1-kilogram mass is held in place, and the spring is compressed by pushing on the...
4. ### Work problem

Ok...Here is the problem. A block of mass 4 kilograms, which has an initial speed of 6 meters per second at time t=0, slides on a horizontal surface. (a) Calculate the work W that must be done on the block to bring it to rest. For this problem, I used the formula W= 1/2mvf ^2– 1/2mvi ^2...
5. ### Velocity and Acceleration

I really mix up and/or combine velocity and acceleration. The change from constant acceleration to constant velocity really confused me, because I know that acceleration can remain constant.
6. ### Velocity and Acceleration

So, if I use 5m/s^2 and solve for velocity, I get 10m/s, then when I solve for the time, I get 10s. Is that right, because I got really confused when it mentioned constant acceleration and velocity.
7. ### Velocity and Acceleration

Ok, I used that formula, and ended up getting 5 m/s^2. Is that what I should have gotten or did I mess up again somewhere.
8. ### Velocity and Acceleration

Ok, I have this problem... The first 10 meters of a 100 meter dash are covered in 2 seconds by a sprinter who starts from rest and acceleraties with a constant acceleration. The remaining 90 meters are run with the same velocity the stprinter had after 2 seconds. a) Determin the sprinter's...
9. ### Moment of inertia

I mainly need to know how to determine the axis, and the difference between a hoop and a cylinder...mainly, (MR^2) and (1/2 MR^2)
10. ### Moment of inertia

does anyone know an easier way to determine which formula is used for calculating moment of inertia? i have all the formulas and descriptions, but i have trouble figuring out which formula to use based on what is given in the problem. any ideas thatll help me?
11. ### Pool ball collision physics

I solved for the final velocity, and I got 10.51m/s. Then I used the conservation of momentum equation, and for the velocity of the croquet ball, I got 4.95m/s. So, to find the distance from the collision point, would I just use this kinematics equation, x=1/2Vft? The answer that I got is...
12. ### Pool ball collision physics

To find the velocity of the croquet ball, is that even possible, without the time? Could I use the .80 seconds as a point in time and base my info off of the collision?
13. ### Pool ball collision physics

I swear, this is the last problem that I have. Here it goes... A pool ball having a mass of .65 kg experiences an elastic collision with a croquet ball having a mass of 1.38 kg. The pool ball had been rolling for 4.3 seconds, having covered a distance of 22.6 meters during that time. The...
14. ### Confused on velocity

Ok, let me check what I did. I just wanted to make sure, because it really didn't sound very realistic to me. Great! I redid the problem, and everything came up equivalent to each other. Thanks for your help. It's really gonna help me on my exam tomorrow! :)
15. ### Confused on velocity

When I solved for the final velocity, I solved for potential gravitational energy, I multiplied mgh, and I got 588.6. Then I set that equal to kinetic energy, which is 1/2mv^2. I solved for velocity, and I got 6.26 m/s. From there, I took the velocity and used a kinematics equation to solve for...
16. ### Confused on velocity

No, the problem is very vague. It doesn't specify anything about the hill, or give any more info on the can itself. If it is a conservation of momentum problem, wouldn't that mean that the can would be traveling really fast once it left the cart?
17. ### Confused on velocity

Here's my predicament... A 30.0 kg shopping cart full of groceries sitting at the top of a 2.0 meter hill rolls until it hits a tree stump at the bottom of the hill. Upon impact, a .25 kg can of peaches flies out of the cart. What is the velocity of the can as it leaves the cart? I tried...
18. ### Solving for time and displacement

Ok, here's the problem that I am working on now. Sarah is walking at a speed of 1.5m/s when she accidentally slips on a patch of ice whose coefficient of kinetic friction is 0.060. If Sarah has a mass of 40.0 kg, how long before she comes to a stop on the ice? I'm stuck because I don't know...
19. ### Helicopter final velocity help

When you say subtract the distances to find the distance in between, are you talking about subtracting the 40.38 meters from the 70.4 meters? Now I have everything confused. Really confused. Sorry if I am making this harder than it is, but I really need to understand this for my exam tomorrow...
20. ### Helicopter final velocity help

Instead of adding, which is what I did, I would just have to subtract, which would give me an answer of 40.38. Is that a reasonable answer, I'm still confused with the velocity though. I understand gravity being negative because it is downward, but when using 30m/s as the velocity, wouldn't the...
21. ### Helicopter final velocity help

Ok, after I solved it, I got an answer of 79.62 meters. Is that somewhat right, or did I screw up again? It seems like solving the problem was too easy, or am I making it more complicated?
22. ### Helicopter final velocity help

So, to calculate the distance between the helicopter and the package after the rope was cut, would I use the final velocity that I calculated as my initial velocity of the package, use the acceleration of gravity?
23. ### Helicopter final velocity help

Okay...I am think that I am totally lost on this problem. A helicopter holding a 70-kilogram package suspended from a rope 5.0 meters long accelerates upward at a rate of 5.2 m/s^s. When the upward velocity of the helicopter is 30 meters per second, the rope is cut and the helicopter...
24. ### Mouse trap cars

Does anyone have any tips on how to make/build a mouse trap car, with the mouse trap being the only source of energy? I have an idea of what it should look like, and how it should work, but I'm really not sure. Is there any helpful hints that I might need while building my project for my physics...
25. ### Collisions of hockey pucks

Okay, here's the problem I'm working on... A .50 kg hockey puck moving at a speed of 5.70 m/s collides with a stationary hockey puck of equal mass. After the collisions, the first puck moves off in a direction 60 degrees to the left of its original direction, while the second puck moves off at...
26. ### Naming Ionic formulas

Well, for the third problem, I kinda typed the question on the opposite page. The correct problem should have been Hg2Cl2, which I think would be Mercury (I) chloride.
27. ### Naming Ionic formulas

The problems that I was having trouble with are: CuC2H3O2 and CaC2O4 *the numbers are subscripts by the way* for the first one I got Copper carbon hydrogen peroxide for the second one I got Calcium oxalate. Also, I'm not sure if I did this problem right: Hg2Cl2 For the answer, I got Copper...
28. ### Naming Ionic formulas

Okay, I am so confused about how to determine whether or not you have to use the parenthesis with the Roman numeral. It is confusing me because some of the compounds that I have to write the name for, are ternary compounds, and I'm not sure which order they go in. :confused:
29. ### Find the magnitude of the force that stops the bullet

Thanks, I really was lost because of the "depth" part.
30. ### Find the magnitude of the force that stops the bullet

HELP Please!! Ok, I am totally lost on how to solve this problem: A 5 g bullet moving at 600 m/s penetrates a tree trunk to a depth of 4 cm. a. use work and energy considerations to find the magnitude of the force that stops the bullet b. assuming that the frictional force is constant...