Dave Smith
Email the instructor at this address, from your VCCS email, requesting an access code.
Labs, tests, homework.
Homepage is at http://www.vhcc.edu/ph1fall9/
Course of study will be revised by Wednesday to reflect the policy that you have to pass both the lab part and the test part to pass the class.
For for submitting much of your assigned work is at http://www.vhcc.edu/dsmith/class_work_form.htm .
Do a 15-second timing of pendulums of length 10 cm, 20 cm and 40 cm. If you don't have 40 cm then do 10, 15 and 20 cm.
For each length figure out how long it took to complete each cycle, on the average. Give your results rounded to the nearest hundredth of a second. The time required for a complete cycle is called the period of the pendulum. The period of the 10 cm pendulum will be Item 4, the period of the 20 cm pendulum will be Item 5 and the period of the 40 cm pendulum will be Item 6.
Calculating the period: We find the period, the time per cycle, by dividing the time required by the number of cycles. The calculation is, for example (assuming 25 cycles in 15 seconds for some length),
(15 seconds) / (25 cycles) = .6 seconds / cycle,
which tells us that the time for a cycle is .6 seconds.
After you've made your graph, do a count for a pendulum whose length matches that of a piece of 8.5 x 11 paper. Then use your graph to figure out the length of the paper.
Synchronize the bracket pendulum with a washer pendulum in such a way that the two pendulums are released simultaneously, and the bracket pendulum strikes the bracket at exactly the time the washer pendulum has completed its first cycle.
Ramp with marble, one end between 1 and 3 cm higher than the other. The release of the marble and the bracket pendulum should be simultaneous. The bracket pendulum should 'hit' at the same instant the ball reaches the end of the ramp.
Complete the questions in the document Pend 01