In an RL circuit with time constant 3.0 s, what does the time constant become if the resistance is doubled and the inductance is tripled?,
a. 2.0 s
c. 9.0 s
b. 18 s
d. 4.5 s
D
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You push horizontally on a 120-N box that is initially resting on a horizontal table. The coefficient of static friction between the box and the table is 0.75,
and the coefficient of kinetic friction is 0.40. Find the friction force on the box if the push is equal to (a) 84 N; (b) 94 N.
As the Sun rotates, an individual sunspot can be tracked across its face. From eastern to western limb, this takes about:
A) 12 hours. B) a week. C) two weeks. D) a month. E) 5.5 years.
Acceleration: Which of the following situations is impossible?
A. An object has velocity directed east and acceleration directed west. B. An object has velocity directed east and acceleration directed east. C. An object has zero velocity but non-zero acceleration. D. An object has constant non-zero acceleration and changing velocity. E. An object has constant non-zero velocity and changing acceleration.
Distinguish between ac and dc. When you plug a light bulb into a wall outlet, where is the source of electrons?
What will be an ideal response?