# Recent content by physicssss

1. ### Momentum collision between the ball and the floor

ok well think about it like this. if you drop a ball and it bounces back up its velocity decrease as it goes back up because its distance decreases as it bounces back up. and since momentum=velocity multiply by mass i think momentum decreases. Now for the case of the horizontal momentum i just...
2. ### Propagation of error help

Homework Statement I slide a ball off of a ramp (the ramp is on a table) and the ball hits the ground and bounces horizontally and vertical. I know that horizontal velocity = horizontal distance*sqrt(gravity/2*height) or d*sqrt(g/2h) I want to know the equation for calculation error. The...
3. ### Momentum collision between the ball and the floor

Homework Statement I throw a ball horizontally During the first collsion between the ball and the floor Select one: a. Both horizontal and vertical momentum of the ball are conserved b. The horizontal momentum of the ball decreases and the vertical momentum decreases c. The horizontal...
4. ### Moment of inertia and angular acceleration

its a suspended mass attached to to the hub of a bicycle wheel through a pulley. so basically we release the wheel (which is attached to a table) and it turns from the weight of the suspended mass until the mass reaches the floor. Anyways I have come to a new conclusion that the angular...
5. ### Moment of inertia and angular acceleration

Homework Statement If the fall height of the mass is doubled, the angular acceleration of the wheel will a. decrease by an unkown amount b. remain unchanged c. decrease by a factor of 2 d. increase by an unknown amount e. increase by a factor of 2 Homework Equations The...
6. ### Help with vector space of real value functions

Thanks for trying to help LCKurtz. I still don't quite understand it though. (f+g)(4)=f(4)+g(4)=0? I don't know what to use for f or g equation wise so I don't know how I'm suppose to plug in 4.
7. ### Help with vector space of real value functions

Homework Statement The set of all real-valued functions f defined everywhere on the real line and such that f(4) = 0, with the operations (f+g)(x)=f(x)+g(x) and (kf)(x)=kf(x) verify if all axioms hold true. Homework Equations Axioms 1 and 6 These closure axioms require that if we add...
8. ### Help with vector spaces axioms

thanks for the confirmation :)
9. ### Help with vector spaces axioms

Homework Statement for the 2x2 matrix [a 12;12 b] is it a vector space Homework Equations 1. If u and v are objects in V, then u+v is in V 2. u+v = v + u 3. u+(v+w) = (u+v)+w 4. There is an object 0 in V, called a zero vector for V, such that 0+u = u+0 = u for all u in V 5. For each u in V...