i.. actually don't know how to take the cross product of vectors in cartesian coordinates :( but anyhow, after i find the angular momentum, how do i figure out which direction it's going? because i have to give the angular momentum in vector notation.
sorry i was referring to the second problem. but on the first problem, how do i know how fast the stuck-together objects are going in the x or y directions? would they both be moving -3j down and 4.2i across? if so, would i determine the angular momentum in the j direction by doing
(-.5)(2.6...
how do you determine which way the velocity of stuck-together particles are going? would i just use pythagorean theorem to find the hypotenuse of the 4.2 velocity and the -3 velocity? and from there, how do i figure out which way the momentum is going? how can there be momentum in the 'k'...
If anyone can help with any of these, I would really really appreciate it!
With center and spokes of negligible mass, a certain bicycle wheel has a thin rim of radius 0.38 m and weight 37 N. It can turn on its axle with negligible friction. A man holds the wheel above his head with the axle...
A uniform thin rod of length 0.50 m and mass 4.0 kg can rotate in a horizontal plane about a vertical axis through its center. The rod is at rest when a 3.0-g bullet traveling in the horizontal plane of the rod is fired into one end of the rod. As viewed from above, the direction of the bullet's...
A thin, uniform rod of length L = 0.850 m and mass M rotates horizontally about an axis through its center, at an angular velocity 18.5 rad/s. A particle with mass M/3.00 is attached to one end. The particle is then ejected from the rod by a small explosion. The explosion sends the particle...
A 2.6 kg particle that is moving horizontally over a floor with velocity (-3.00 m/s)j undergoes a totally inelastic collision with a 4.00 kg particle that is moving horizontally over the floor with velocity (4.20 m/s)i. The collision occurs at xy coordinates (-0.50 m, -0.10 m). After the...
A wheel is rotating freely with an angular speed of 800 rev/min on a shaft whose rotational inertia is negligible. A second wheel, initially at rest and with twice the rotational inertia of the first, is suddenly coupled to the same shaft. What is the angular speed in rev/min of the resultant...
i tried using the center of mass for a system of particles formula (m1x1 + m2x2 + ...)/(m1 + m2 + ...) using ricardo's seat as the starting point, but that gave me 3 kg as carmelita's mass, which I'm pretty positive is wrong.
Can anyone explain to me how to do the following problem?
Ricardo, mass 75 kg, and Carmelita, who is lighter, are enjoying Lake Merced at dusk in a 20 kg canoe. When the canoe is at rest in the placid water, they exchange seats, which are 3.0 m apart and symmetrically located with respect to...