You measure the velocity of an electron to an accuracy of ±22.6 m/s
What is the minimum uncertainty in its position? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg)
A) 5.12 µm B) 8.05 ?m C) 4.03 ?m D) 16.1 ?m E) 32.2 ?m
A
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Estimation: A reasonable estimate for the mass of an ordinary passenger car is
A. 100 kg B. 1000 kg C. 5000 kg D. 10,000 kg
Waves on a String: A crane lifts a 2500-kg beam at a steady rate of 15 cm/s using a steel cable whose mass per unit length is 0.65 kg/m. What is the speed of transverse waves on this cable?
A. 230 m/s B. 580 m/s C. 1200 m/s D. 1900 m/s E. 190 m/s
Pulsars
A) spin very rapidly when they're young. B) are the cause of gamma-ray bursts. C) spin very slowly when they're young, and gradually spin faster as they age. D) generally form from 25 solar mass stars. E) emit radio in all directions.
A pipe open at both ends resonates at a fundamental frequency fopen. When one end is covered and the pipe is again made to resonate, the fundamental frequency is fclosed. Which of the following expressions describes how these two resonant frequencies compare?
1. fclosed = fopen 2. fclosed = 3/2 fopen 3. fclosed = 2fopen 4. fclosed = 1/2 fopen 5.none of these