Recent content by spyroarcher

Homework Statement There is a circle of equation x^2+y^2=1 and a vector field F (x; y) =< y + .5x, x + .3y >. Imagine the field zoomed in extremely close at (0,1), to the point where it looks like a constant field of <-1,.3>. Calculate the work from say (0,1) to (-.001, 1). The constant field...

Yes that is the full question, if it is impossible, how would the book get 10? It also said p=F(change in T) for the answer

Homework Statement If the block starts from rest, its momentum at 5 seconds is... Homework Equations p=mv F=ma v=at The Attempt at a Solution When I thought about it, I was thinking about p=mv, and I had to substitute v to get a desirable answer. So I did p=m(at). However I only...

Homework Statement A force of 5N acts on a 15kg body initially at rest. Compute the work done by the force in: first, second, and third seconds, the instantaneous power to the force at the end of the third sec. Homework Equations W=fd P=(dW)/(dt) The Attempt at a Solution I'm not...

I finally got it! The steps I did: ma=F(cent)+F(g), a=0 F(cent)=-F(g) (mv^2)/R=-mg Then after the cancel with the mass and some value plugging I get 49.5m/s. However I am a bit shaky on the whole idea of the F(N) and F(cent), but I generally get it since both F(cent) and F(N) are inward...

Just to clarify, I want the net acceleration to be 0 for the car not to leave the road? Also explain to me why would you want the magnitude of normal force and centripetal force equal? (I don't understand the concept) Also thanks for bearing with me.

So would I begin with F(net)= F(N)+F(G)+F(centripetal)=0 and try solving from there?

The only forces I am aware of on the car is friction (I'm not sure if it is incorporated into this problem), gravity and the normal force. Also from what I can understand, that equation just represents the magnitude of centripetal force, wait so would the magnitude be the Force of gravity and...

I actually don't know too many equations, my teacher barely teaches, so I practically have to rely on my physics textbook, and I don't completely understand it...

Homework Statement A person drives a car (without negative lift) over the top of a hill, the corss section of which can be approximated by a circle of radius 250m. What is the greatest speed at which he can drive without the car leaving the road at the top of the hill? Homework Equations...

Homework Statement A person throws a 175 gram ball by exerting a force of 10N, 45 degrees. a) Determine the resulting acceleration of the ball. b) Repeat for the same amount of force applied by the girl in a downward direction. Homework Equations F=ma The Attempt at a Solution...

Wait is the x component going to be 40? and how is it not 30 degrees

Homework Statement It's quite a handful but: 1. A train is moving east at 30m/s along a long, straight section of track. A person on the train has a dart gun that can shoot rubber-tipped darts at a speed of 10m/2. If the person aims the gun at an angle of 30 degrees north of east (I think it...