What is the radius of the smallest electron orbit in a singly-ionized helium atom?
A) 1.06 × 10-10 m B) 1.32 × 10-11 m C) 5.29 × 10-11 m D) 2.65 × 10-11 m
D
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Calculate the linear speed due to the Earth's rotation for a person at 40° north latitude on the Earth. The radius of the Earth is 6.40 × 10^6 m
a. 74.0 m/s c. 465 m/s b. 356 m/s d. 73.0 m/s
Power: A series ac circuit containing a resistor, inductor, and a capacitor has a peak voltage of 116 V and a peak current of 2.00 A. If the current lags the voltage by 52.0°, what is the average power of the circuit?
A. 71 W B. 142 W C. 148 W D. 296 W
In what part of spiral galaxies do new stars form?
A) In the bulge. B) In the spiral arms. C) No new stars are forming anywhere. D) In the halo. E) No new stars form inside spirals. They form outside the galaxy and are pulled in.
The dimensionless ratio U?/?Lg , called Froude number, is a measure of similarity between an ocean-going ship and a scale model of the ship to be tested in a laboratory water channel. A 150 m long cargo ship is designed to run at 36 km/h, and a 1.5 m geometrically similar model is towed in a water channel to study wave resistance. What should be the towing speed in m s–1?
A ship model and its prototype
Froude number = U? /?Lg is a measure of similarity
Ship length (Ls) = 150 m
Ship speed (U?s) = 20 knots
Model length (Lm) = 1.5 m
FIND
Model towing speed (U?m)
SKETCH
