PHY2CL Solutions Winter 2008

# PHY2CL Solutions Winter 2008 - Solutions to Final Exam 2CL,...

This preview shows pages 1–2. Sign up to view the full content.

Solutions to Final Exam 2CL, Winter 2008. 1. The power P dissipated at two resistors R 1 and R 2 connected in series is P=I 2 (R 1 +R 2 ), where I is the applied current. A student measures R 1 =100 ± 4 and R 2 =15 ± 3 , while I=72 ± 5 mA. a) Calculate the value of P and its uncertainty. * (8 points) b) Which one of the uncertainties for parameters I, R 1 and R 2 contributes the most to the uncertainty of P? (2 points) * Reminder: Power is measured in Watts: 1 Watt = 1 Volt • 1 Ampere, or 1W= (1 A) 2 • 1 Solution: a) P=(72mA) 2 *(100+15) =0.596 W 0.60 W Answer: P=0.60 ± 0.09 W (2 points for correct value of P=0.60 W, and 6 points for arriving at correct value of uncertainty). 2. A student measures the discharge time constant for a capacitor 9 times, with the following results: t (ms): 4.40, 4.64, 4.29, 4.59, 4.47, 4.37, 4.61, 4.53 and 4.43. a) Assuming normal distribution of values, what is the best estimate for the true value of the time constant t and its uncertainty? (5 points)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 06/04/2008 for the course PHYS 2CL taught by Professor Bodde during the Spring '08 term at UCSD.

### Page1 / 4

PHY2CL Solutions Winter 2008 - Solutions to Final Exam 2CL,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online