PHYSICS questions HELP!!!, answer any of them ASAP please and thank you.........from Urbanski's class?
these are physics essays:
1.) A 28-g rifle bullet traveling 230 m/s buries itself in a 3.6-kg pendulum hanging on a 2.8-m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal components of the pendulums displacement.
2.) a 12-kg hammer strikes a nail at a velocity of 8.5m/s and comes to rest in a time interval of 8 ms (a.) what is the impulse given to the nail? (b.) what is the average force acting on the nail?
3.) a ball of mass .440 kg moving east (+x direction) with a speed of 3.30 m/s collides head on with a .220 kg ball at rest. fi the collision is perfectly elastic, what will the speed and direction of each ball after the collision??
18.) a.10 kg ball is dropped onto a table top, the speeds of That ball right before and right after hitting the table top are 4.0 m/s and 4.0 m/s, respectively. If the collision between the ball and the table top lasts .15 seconds what is the magnitude of the average force exerted on th ball by the table top?
a) .67 N
b.) 1.3 N
c.) 3 N
d.) 6 N
19.) a 2 kg softball is pitched to you at 20 m/s. you hit the ball back along the same path and at the same speed. I f the bat was in contact with the ball for .10 seconds what is the magnitude of the average force the bat exerted?
6.) a 2 kg mass moves with a speed of 5 m/s. It collides head-on with a 3 kg mass at rest. If the collision is perfectly elastic, what is the speed of the masses after the collision?
a.) 10 m/s
b.) 2.5 m/s
c.) 2.0 m/s
d.) zero, since the collision is inelastic
13.) a 3 kg mass is positioned at ( 0, 8) and a 1.0 kg mass is positioned at ( 12, 0 ) . What are the coordinates of a 4.0 kg mass which will result in the center of mass of the system of three masses being located at the orgin (0, 0) ?
a.) (-3, -6)
b.) ( -12, -8)
c.) ( 3, 6)
d.) ( -6, -3)
16.) a .060 kg tennis ball initially moving at a speed of 12 m/s is struck by a racket causing it top rebound in the opposite direction at a speed of 18 m/s. What is the change in momentum of the ball?
a.) 0.36 kg*m/s
b.) 0.72 kg*m/s
c.) 1.1 kg*m/s
d.) 1.8 kg*m/s
17.) the center of mass of a two particle system is at the origin. One particle is located at (3 m, 0) and has a mass of 2 kg. What is the location of the second mass of 3 kg?
a.) (-3m, 0)
b.) (-2 m, 0)
c.) (2m , 0)
d.) (3m , 0)
- 1 decade agoFavorite Answer
heyy!!.. okay u r in my class! and i found this by looking for number 3... but for number 16 i looked online and i got 1.8 kg*m/s but im not sure if its right..