Physics, 17.12.2020 06:40 kaileelmiller71
An object is released from rest at a height H near and above the surface of Earth. As the object falls toward the surface, Earth's atmosphere exerts a resistive force
on the object such that it reaches a terminal velocity before it reaches the ground. Which of the following claims is true? Select two answers.
А
The system consisting of only the object is an open system.
B
Earth's atmosphere does negative work on the object as it falls toward the surface.
С
The change in the object's kinetic energy from the instant it is released from rest, to the instant it reaches terminal velocity, is zero.
D
The total mechanical energy of the object-Earth system remains constant at all times in which the object is in motion.
Answers: 3
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The ability to make things happen is also called a. heat b. force c. matter d. energy
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Physics, 22.06.2019 22:40
Which of the following is a direct benefit of the use of assembly lines in production a. laws against theft fraud and coercion are needed to protect free choice. b. the government needs to plan efficient outcomes. c. competition among producers by itself cannot ensure a wide range of consumer choices. d. works pressure the government to guarantee minimum wages
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Physics, 22.06.2019 23:40
Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)
Answers: 1
An object is released from rest at a height H near and above the surface of Earth. As the object fal...
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