The current through a piece of lab equipment must be limited to 2.75 A when it is run by a 120-V dc power supply. What must be the resistance of this equipment?
What will be an ideal response?
43.6 ?
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Thermal efficiency (non-Carnot) is
A) Q/T. B) Q/m. C) 1 – Qcold/Qhot. D) Q - W. E) 1 - Tcold/Thot.
What is an artificial star?
A) a meteor B) the unseen member of a binary star system C) a satellite orbiting Earth D) a point of light in Earth's atmosphere created by a laser for the purpose of monitoring atmospheric fluctuations E) a possible source of dark matter in the universe
According to Einstein, events that are simultaneous in one frame of reference
A) are simultaneous in all frames of reference. B) are not simultaneous in other frames of reference. C) may or may not be simultaneous in other frames of reference.
Ripples in the Cosmic Microwave Background correspond to:
A) matter density fluctuations. B) temperature fluctuations. C) energy fluctuations. D) fluctuations in both matter and radiation. E) imperfections in measurement techniques or equipment.