If an electric charge is rapidly shaken up and down,
A) sound is emitted.
B) light is emitted.
C) electron excitation occurs.
D) an electromagnetic wave is produced.
Answer: D
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A glass flask has a volume of 500 mL at a temperature of 20°C. The flask contains of mercury at
The temperature of the mercury and flask is raised until the mercury reaches the reference mark. The coefficients of volume expansion of mercury and glass are 18 × 10-5 K-1 and 2.0 × 10-5 K-1, respectively. The temperature at which this occurs is closest to A) 122°C. B) 112°C. C) 102°C. D) 110°C. E) 132°C.
If a star's apparent visual magnitude is equal to its absolute visual magnitude, how far is the star located from Earth?
a. 0 pc b. 1 pc c. 10 pc d. 100 pc
A 1.0-kg ball is attached to the end of a 2.5-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point in its swing when it is moving horizontally, the ball collides elastically with a 2.0-kg block initially at rest on a horizontal frictionless surface. What is the speed of the block just after the collision?
a. 2.3 m/s b. 4.7 m/s c. 3.5 m/s d. 3.0 m/s e. 7.0 m/s
RC Circuits: In the circuit shown in the figure, all the capacitors are initially uncharged when the switch S is suddenly closed, and the battery is ideal. Find (a) the maximum reading of the ammeter and (b) the maximum charge on the 5.00-µF capacitor.
What will be an ideal response?