#$&*
course phy241
9/15 9. Ive had this done for a while but my internet has been really picky on wether it wants to work or not
Questions:1. What was your count for the pendulum bouncing off the bracket, and how many seconds did this take? What therefore is the time in seconds between collisions with the bracket? What was the length of your pendulum?
32 hits in 10 secs. .31 secs between hits
2. What was the period of your pendulum when it was swinging freely? Give your data and briefly explain how you used it to find the period. How does your result compare with the time between 'hits' in the first question?
?
3. Give your data for the ball rolling down the ramp, using the bracket pendulum as your timer. Assuming the ball traveled 30 cm each time, what are the resulting average velocities of the ball for each number of dominoes?
1 dominoe: 7,7,7 clicks= 2.12 secs, 13.7cm/sec
2 dominoes: 5,5,5 clicks=1.56 secs, 19.23cm/sec
3 dominoes: 4,4,4 clicks=1.25 secs, 24cm/sec
4. How did your results change when you allowed the ball to fall to the floor? What do you conclude about the time required for the ball to fall to the floor?
It took it almost the same amount of time to hit the floor with each of the number of dominoes
it's not clear what you mean the 'time to hit the floor'
if you give your data then there will be a basis for drawing conclusions
5. Look at the marks made on the paper during the last class, when the ball rolled off the ramp and onto the paper. Assuming that the ball required the same time to reach the floor in each case (which is nearly but not quite the case), did the ball's end-of-ramp speed increase by more as a result of the second added domino, or as a result of the third? Explain.
The second judging by the fact that the distance on the paper was slightly farther apart from 1 to 2 than 2 to 3
6. A ball rolls from rest down a ramp. Place the following in order: v0, vf, vAve, `dv, v_mid_t and v_mid_x, where the quantities describe various aspects of the velocity of the ball. Specifically:
* v0 is the initial velocity,
* vf the final velocity,
* vAve the average velocity,
* `dv the change in velocity,
* v_mid_t the velocity at the halfway time (the clock time halfway between release and the end of the interval) and
* v_mid_x the velocity when the ball is midway between one end of the ramp and the other.
Explain your reasoning.
v0
You need to explain your reasoning.
7. A ball rolls from one ramp to another, then down the second ramp, as demonstrated in class. Place the following in order, assuming that v0 is relatively small: v0, vf, vAve, `dv, v_mid_t and v_mid_x .
same as above
Place the same quantities in order assuming that v0 is relatively large.
same as about because all the rest will still be larger than v0
Which of these quantities will larger when v0 gets larger? Which will get smaller when v0 gets larger? Which will be unchanged if v0 gets larger?
Vf and vAve and v_mid_x,v_mid_t,`dv
it's not clear which means which
8. If a ball requires 1.2 seconds to travel 30 cm down the ramp from rest:
* What is its average velocity?
* What is its final velocity?
* What is the average rate of change of its velocity?
Be sure to explain your reasoning.
vAve=25cm/sec, 30cm/1.2sec
vf=
&#Be sure to see my note(s), inserted at various places in this document, and let me know if you have questions. &#