What is the inductance of a series RL circuit in which R = 1.0 K? if the current increases to one-third of its final value in 30 ?s?
A. 74 mH
B. 99 mH
C. 49 mH
D. 62 mH
E. none of the above
Answer: A
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A ball is thrown vertically upward with an initial speed of 20 m/s. Two seconds later, a stone is thrown vertically (from the same initial height as the ball) with an initial speed of 24 m/s. At what height above the release point will the ball and stone pass each other?
A. 17 m B. 21 m C. 18 m D. 27 m E. 31 m
The supernova generated by the explosion of a high mass star fades slowly because of energy generated by ____
a. magnetic fields around the neutron star b. disintegration of iron in the core of the star c. radioactive decay of nickel formed in the expanding shell of the supernova d. fusion of the remaining hydrogen in the star e. matter-antimatter disintegration around the collapsed core
A 200-g mass attached to the end of a spring causes it to stretch 5.0 cm. If another 200-g mass is added to the spring, the potential energy of the spring will be
A) twice as much. B) times as much. C) the same. D) 4 times as much. E) 3 times as much.
What forces are included in a free-body diagram for an object? a. The forces acting on the object and the forces the object exerts on any other objects it is in contact with. b. The forces acting on the object and the forces the object exerts on all other objects in the system
c. Only the forces acting on the object. d. Only forces internal to the object.