Scientists use the metric system chiefly because it is more accurate than the English system
A) True B) False
B
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In present day technology, a substance can become a superconductor
A. only at absolute zero temperature. B. at room temperature. C. at a temperature above the boiling point of water. D. at temperatures above 0 Kelvin but less than 100 Kelvin.
The accelerating force of the wind on a small 300-kg sailboat is 780 N northeast. If the drag of the keel is 552 N acting west, what is the acceleration of the boat?
a. 4.4 m/s2 due east b. 1.8 m/s2 due north c. 2.6 m/s2 northeast d. 3.2 m/s2 north by northwest e. 0.23 m/s2 due east
When the reflection of an object is seen in a convex mirror the image will:
a. may be either real or virtual. c. always be virtual. b. will always be enlarged. d. always be real.
A uniform rod of length (L = 2.0 m) and mass (M = 1.5 kg) is pivoted about a horizontal frictionless pin through one end. The rod is released from rest at an angle of 30° below the horizontal. What is the angular speed of the rod when it passes through the vertical position? (The moment of inertia of the rod about the pin is 2.0 kg×m2.)
a. 3.5 rad/s b. 2.7 rad/s c. 3.1 rad/s d. 2.3 rad/s e. 1.6 rad/s