Physics, 12.06.2020 13:57 skylarjane1030
Which of these correctly describes the work done on a book when a person lifts it vertically, at a constant speed?
A. Negative work was done on the book because the book was displaced in the direction opposite to which the force was applied.
B. Work was done on the book because the book displaced in the direction a force was applied.
C. Work was not done on the book because it moved at constant velocity and so there was no net force acting on the book.
D. Work was not done on the book because it exerted as much force on the person lifting the book as the person exerted on it.
Answers: 2
Physics, 22.06.2019 10:20
Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?
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Physics, 22.06.2019 11:00
The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.
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Physics, 22.06.2019 22:30
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Which of these correctly describes the work done on a book when a person lifts it vertically, at a c...
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