A girl swings back and forth on a swing with ropes that are 4.00 m long. The maximum height she reaches is 2 m above the ground. At the lowest point of the swing she is .5 m above the ground. (a) The girl attains the maximum speed (1)at the top, (2) in the middle, (3) at the bottom of the swing...
Ahh I think figured it out. The W would be equal to =-153.125J. Then I would just use F=W/D or F=-153.125 J/.12m and that comes out to be....-1276.04. Is that correct?
[SOLVED] Force with kinetic energy question
A 2.5-g bullet traveling at 350 m/s hits a tree and slows uniformly to a stop while penetrating a distance of 12 cm into the tree's truck. What force was exerted on the bullet in bringing it to a rest?
Not sure on this one. I know to find to...
[SOLVED] Easy Spring Constant Question
A particular spring has a force constant of 2.5 x 10^3 N/m. (a) How much work is done in stretching the relaxed spring by 6.0 cm? (b) How much more work is done in stretching the spring an additional 2.0 cm?
I am using W=1/2kx^2 but I am not...
wait...Ah I'm doing another problem...sorry!! See I can figure out the problems that don't involve angles...those angles are so complicated! Ah back to trying to solve the first one... the one I solved was..."A jet catapult on an aircraft carrier accelerates a 2000 kg plane uniformly from rest...
I think I figured it out....First off...
M=2000 KG
Vi=0
Vo=320 km/hr = 88.88 m/sec
T=2.0 sec
Ok, I then used the equation D=1/2(Vo+Vi)T which turned out to be 88.88 M. So D=88.88 M. Then I used the equation A=V/T. That turned out to be 44.44 m/sec^2. Finally, I used Fnet=ma. This turned out to...
In series the amps are the same throughout every resistor. In parallel the amps all add up to a total amperage. I'm pretty sure I know how to do it..see if you can figure out the rest.
An object (mass 10.0 kg) slides upward on a slippery vertical wall. A force F of 60 N acts at an angle of 60 degrees (the force is 60 degrees South of the x+ axis, it's shown in a picture) Determine the normal force exerted on the object by the wall. Next, determine the object's acceleration...
Man...sorry about all that. I can't seem to do any of these problems from this chapter without intense meltdowns or whatever you want to call it. I'm going to try from the beginning of this chapter and work my way through.
D=V/A? I've never seen that equation before. woah woah I'm getting closer...VF^2=VI^2+2A(D) so in other words D=VF^2-VI^2/2A.....VF=0 (since it's at rest)...VI would be 25 m/sec and A is 4.9 m/sec^2. So...I get arggggg!! I have a program that does it for me but it doesn't show what it's doing. I...
Ok, then the acceleration is -9.68 m/sec squared. Now to find the distance..jesus I need a tutor or something..I've spent nearly 2 hours on this one problem..
I have no clue man! Is there not just one equation to use? I see that I have an initial velocity of 25 m/sec. Okay, so I if I plug that in to F=m*g*sin(30) wait I can't plug that into that since I don't know m. Ugh...I'm so lost.
m*g*sin(30) but it doesn't give a mass so I can't use that equation can I? Yeah, we just got done with kinetic energy. There are just way too many equations and my teacher doesn't explain it to us very well. She works the problems then goes to another problem. I've never felt so stupid before...
[SOLVED] Angles and forces/normal force...
1. A car coasts (engine off) up a 30 degree grade. If the speed of the car is 25 m/s at the bottom of the grade, what is the distance traveled by the car before it comes to rest?
2. Umm...I have no idea what equations are used in this problem. I...