Express the result of the following calculation to the proper number of significant figures: 50.19 - 7966 × 10-3
What will be an ideal response?
42.22
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A conducting bar of length L rotates with a constant angular speed of +2.0 rad/s about a pivot P at one end, as shown. A uniform magnetic field (magnitude = 0.20 T) is directed into the paper. If L = 0.40 m, what is the potential difference, VA ? VP?
a.
?12 mV
b.
+8.0 mV
c.
?8.0 mV
d.
+12 mV
e.
?16 mV
Electric power is transmitted over long distances at high voltage because
A) electricity moves faster at higher voltage. B) the lines can be on taller poles. C) lightning does more damage. D) there is less power lost. E) electricity moves slower at higher voltage.
A highway curve has a radius of 0.14 km and is unbanked. A car weighing 12 kN goes around the curve at a speed of 24 m/s without slipping. What is the magnitude of the horizontal force of the road on the car?
A. 12 kN B. 17 kN C. 13 kN D. 5.0 kN E. 49 kN
What kind of lens is it that has a power of +10 Diopters and a first surface center of curvature in front of the lens?
A) double convex B) double concave C) converging meniscus D) plano concave E) plano convex