An apple pie will be a net emitter of energy when its temperature is
A) higher than its surroundings.
B) lower than its surroundings.
C) none of these
Answer: A
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Resistance and Resistivity: You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the largest possible resistance, you should attach the leads to the opposite faces that measure
A. 3 cm × 5 cm. B. 3 cm × 8 cm. C. 5 cm × 8 cm. D. Any pair of faces produces the same resistance.
A car of mass 1 000 kg moves with a speed of 50 m/s on a circular track of radius 100 m. What is the magnitude of its angular momentum (in kg×m2/s) relative to the center of the race track?
a. 5.0 × 10^2 b. 5.0 × 10^6 c. 2.5 × 10^4 d. 2.5 × 10^6 e. 5.0 × 10^3
Any massive object that is moving will
always have a) An unbalanced force acting on it. b) kinetic energy. c) angular momentum. d) potential energy.
Lens-Maker Formula: A double-convex thin lens has radii of curvature of magnitude 46 cm, and it is made of glass of index of refraction 1.60. What is the focal length of this lens?
A. infinite B. 38 cm C. -30 cm D. 18 cm E. -19 cm