Assuming a 8 kilogram bowling ball moving at 2 m/s bounces off a spring at the same speed that had before bouncing what is the a: momentum of recoil b: what is the change in momentum (hint: what is the change in temperature when something goes from 1 ° to -1°) c: if the interactions with the spring occurs in 0.5 seconds, calculate the average force the spring exert on it d: compare this force with the force on the pillow of 32n

a) 32 kg m/s

Assuming the spring is initially at rest, the total momentum of the system before the collision is given only by the momentum of the bowling ball:

The ball bounces off at the same speed had before, but the new velocity has a negative sign (since the direction is opposite to the initial direction). So, the new momentum of the ball is:

The final momentum after the collision is the sum of the momenta of the ball and off the spring:

where is the momentum of the spring. For the conservation of momentum,

b) -32 kg m/s

The change in momentum of bowling ball is given by the difference between its final momentum and initial momentum:

c) 64 N

The change in momentum is equal to the product between the average force and the time of the interaction:

Since we know , we can find the magnitude of the force:

The negative sign simply means that the direction of the force is opposite to the initial direction of the ball.

d) The force calculated in the previous step (64 N) is larger than the force of 32 N.

nec chapter 5 contains

c. information on special occupancy areas

nec chapter 6 covers

a. special equipment

which of the following rules contain the words shall or shall not and must be adhered to?

b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

c. optional rules

which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

c. nrtls

the nec is published by the

a national fire protection association

the nec is divided into

b. 9 chapters

the nec provides informative annexes for

c. informational materials and examples

two terms from nec article 100 that trainees should become familiar with are

b. labeled and listed

explanation:

hey , the answer is c