Homework Statement
A locomotive accelerates a 24-car train along a level track. Every car has a mass
of 50000 kg and is subject to a frictional force f = 250 v, where the speed v is in
meters per second and the force f is in Newtons. At the instant when the speed of
the train is 28 km/h...
Homework Statement
A juggler is able to handle four balls simultaneously. He takes 0.5 s to cycle each
ball through his hands, throw the ball, and be ready to catch the next ball. (a)
With what velocity must he throw each ball up? (b) What is the position of the
other three balls when he...
Homework Statement
A uniform thin rod of weight W = 100 N is supported horizontally by two vertical
props at its ends. At time t = 0 one of the these supports is kicked out. Find the
force on the other support immediately thereafter.
Homework Equations
F1 + F2 = mg
The Attempt...
Homework Statement
A uniform thin rod of weight W = 100 N is supported horizontally by two vertical
props at its ends. At time t = 0 one of the these supports is kicked out. Find the
force on the other support immediately thereafter.
Homework Equations
Sum of forces??
The...
An "infinitely massive" Ping-Pong paddle moving with a velocity of 20 m/s hits
a "massless" Ping-Pong ball at rest. The collision is elastic. What is the velocity of
the ball after the collision?
i get v2f = (2(infinite mass)/(infinite mass - 0))*20m/s = 40m/s
is this correct?? i don't...
A block sits at the top of a smooth sphere of radius 1m. Suddenly, under the
force of gravity, It begins to slide down the surface of the sphere until it leaves the
surface. At what speed does it leave the surface?
mgcosθ + N = mv^2/R
But N =0
v^2 = Rgcosθ
V^2 = gcosθ
speed = v = (...
A horizontal vinyl record of mass 0.10 kg and radius 0.1 m rotates freely about a vertical axis through its center with an angular speed of 4.7 rad/s. The rotational inertia of the record about its axis of rotation is 0.0005 kg*m^2. A wad of wet putty of mass 0.020 kg drops vertically onto the...