Recent content by kajasu88

well it has to be conservation of momentum... don't know about conservation of force... and has to be c because e would mean that the spit and larry have the same mass. so C?

and vice versa for the x direction

well... in the y direction: Ball one, v initial is w/e v initial is (no value) Ball two v initial is zero.

is the change in KE = 0?? since there is no external forces?

okay so I did: Ball 1 (vertical ball) x: 1/2m(vf^2 - 0) y: 1/2m(vf^2 - vi^2) Ball 2 (horizontal ball) x: 1/2m(vf^2 - vi^2) y: 1/2m(vf^2 - 0) solve for vf pythagorean theorem so the vf is the same.

I don't think it has to do with pushing on the floor because if there is no friction, that wouldn't work right? unless they pushed up, but that wouldn't make him go forward. so spit... thats all i can htink of right now

we did do KE, but can u separate KE in components?

I'm not guessing. I'm going off an experiment in lab when he put two balls on a track, one track was curvy and the other was straight. I think this is the same concept. The ball on the curvy track finished first b/c it gains PE as it goes up and down the curves. They also finished at the same speed.

i figured it out! so yes, 31.1 m/s so KE=(1/2)m(v^2) ... (1/2)(419N / 9.8m/s^2)(31.1 m/s)^2 20,700 kg m^2/s^2 and i got the same answer as two other people

same speed, different times the one thrown vertically will take longer, i don't really know why, I would just imagine that it does. and same speed because they have the same initial velocity... ?

31.1m/s ??

i got the mass by dividing (419N)/(9.8m/s^2) because F=ma then i plugged it into KE=(1/2)m(v^2) V=112km/h (i left it in km/h b/c all the multiple choice answers were in km/h)

No values, just relative to each ball. ie: Do the balls hit the ground at the same time? y/n. which one would hit first? horizontal ball/vertical ball Do the balls hit the ground with the same total speed? y/n

Homework Statement A cheetah whose weight is 419 N runs North at a speed of 112 km/h. What is the cheetah's kineticenergy? Is there a direction? Why or why not? I got 2.68 x (10^5) Is this wrong?

Homework Statement Somehow Larry got stuck in the middle of a room with a frictionless floor. Larry is at rest. How could Larry start moving to get to the edge of the room? A. Push on the floor with his hands or feet. That way the floor could exert a force on him and Larry could...