Some students are discussing why a simple Atwood machine accelerates
Jane says that because of the unequal masses, gravity exerts a constant external torque on the two-mass and pulley system and thus its total angular momentum increases at a constant rate. Is Jane's explanation a valid one?
Yes
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About how old is Earth?
a. 6000 years b. 1 million years c. 1 billion years d. 5 billion years e. 14 billion years
Two in-phase loudspeakers are 3.0 m apart. They emit sound with a frequency of 490 Hz
A microphone is placed half-way between the speakers and then moved along the line joining the two speakers until the first point of constructive interference is found. At what distance from that midpoint is that first point? The speed of sound in air is 343 m/s. A) 0.18 m B) 0.35 m C) 0.50 m D) 0.70 m E) There is no point in that line where constructive interference occurs.
Process of Science: Why is it not science to start with the answer to a question and look for evidence to support it?
What will be an ideal response?
What was needed to develop in Earth's atmosphere to protect organisms from the harmful effects of ultraviolet radiation?
a. weather patterns b. a nitrogenous layer c. a greenhouse effect d. an ozone layer e. reflective clouds