Which of the following characterizes the net force on a particle falling through a fluid at its terminal speed?
a. It is at a maximum.
c. It is downwards.
b. It is upwards.
d. It is zero.
D
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What is the minimum uncertainty in determining the position of an electron if the speed of the electron is 6000 m/s within an accuracy of 0.004%?
A) 0.105 mm B) 0.153 mm C) 0.241 mm D) 0.335 mm E) 0.483 mm
A small town has decided to forego the use of electrical power and send energy through town via mechanical waves on ropes
They use rope with a mass per length of 1.50 kg/m under 6000 N tension. If they are limited to a wave amplitude of 0.500 m, what must be the frequency of waves necessary to transmit power at the average rate of 2.00 kW? A) 24.8 Hz B) 169 Hz C) 60.0 Hz D) 2.07 Hz E) 2.00 kHz
What minimum thickness of oil (n = 1.50) on the surface of water (n = 1.33) would give constructive interference for 550 nm light with normal incidence?
A. 78.0 nm B. 80.0 nm C. 92.0 nm D. 183 nm E. 275 nm
How did Brahe measure highly accurate planetary positions?
A) By careful measurements of the brightness of the planets, as seen from Earth. B) With larger and more elegant sighting instruments. C) By his invention of the technique know as triangulation (measuring the distance between 2 points, and measuring 2 angles, to determine the distance to a 3rd point). D) With the recently-invented telescope. E) With a new type of telescope that used mirrors instead of lenses.