Does a magnetic field exert a force on a stationary object?
1.yes
2.no
2
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A ball rolls over the edge of a table with a horizontal velocity v m/s. The height of the table is 1.6 m and the horizontal range of the ball from the base of the table is 20 m. What is the initial speed of the ball?
A) 9.8 m/s B) 20 m/s C) 35 m/s D) 4.9 m/s E) 70 m/s
A wheel is rotated about a horizontal axle at a constant angular speed. Next it is rotated in the opposite direction with the same angular speed. The acceleration at a point on the top of the wheel in the second case as compared to the acceleration in the first case:
a. is in the same direction. b. is in the opposite direction. c. is upward. d. is tangential to the wheel.
The energy that flows in a sound wave is:
1.kinetic energy only. 2.potential energy only. 3.both kinetic and potential energy. 4.heat energy. 5.thermal energy. 6.all of the above.
An LRC circuit with R = 15 ?, L = 25 mH, and C = 30 ?F, is attached to a 100 V ac (rms) power supply at the resonant frequency
(a) What is the current (rms) in the circuit? (b) What is the power dissipated by the circuit?