What are the standard units for apparent brightness?
A) watts
B) joules
C) Newtons
D) watts per second
E) watts per square meter
E
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What is the strength of the magnetic field at the center of a circular loop of wire of diameter 8.0 cm when a current of 2.0 A flows in the wire? (?0 = 4? × 10-7 T ? m/
A)
Which of the following expresses 72 × 102 g correctly using prefixes given?
Which of the following statements are true about an object in two-dimensional projectile motion with no air resistance? (There could be more than one correct choice.)
A) The speed of the object is constant but its velocity is not constant. B) The acceleration of the object is +g when the object is rising and -g when it is falling. C) The acceleration of the object is zero at its highest point. D) The speed of the object is zero at its highest point. E) The horizontal acceleration is always zero and the vertical acceleration is always a non-zero constant downward.
A block of wood and a block of copper will feel neither hot nor cold to the touch when they each have
A) equal temperatures. B) your temperature. C) equal conductivities. D) none of the above