What kind of a charge can be placed on an electroscope by induction using a glass rod rubbed with silk? Explain
A negative charge is placed on an electroscope by induction when a glass rod rubbed
with a silk cloth is used to charge the rod. A glass rod, when rubbed with a silk cloth,
will possess a positive charge. When the positive charged rod is placed near the knob
of the electroscope, electrons will be attracted to the knob. While holding the charged
rod near the knob, touch the knob with your finger. Electrons will flow from your
body to the electroscope. Remove your finger from the electroscope. The electrons
have no conducting path to leave the electroscope. Thus, the electroscope retains an
excess of electrons and a negative charge.
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A car moving initially at 30 m/s comes gradually to a stop in 900 m. What was the acceleration of the car?
A. -20 m/s2 B. -0.5 m/s2 C. -10 m/s2 D. -5 m/s2
Consider a rope hung from the top of a tall ceiling to the ground. Someone sets up waves from the bottom of the rope and watches as they propagate up the rope. The wave's speed along the vertical rope will
1.remain constant up the rope. 2.increase with vertical position up the rope. 3.decrease with vertical position up the rope. 4.increase until midway up the rope, then decrease.
A fire hose is turned on the door of a burning building in order to knock the door down. This requires a force of 1000. N
If the hose delivers 40. liters per second, what is the maximum velocity of the stream needed, assuming the water doesn't bounce back? A) 50. m/s B) 25 m/s C) 40. m/s D) 15. m/s E) 30. m/s
What is the minimum frequency with which a 300-turn, flat coil of cross sectional area 370 cm2 can be rotated in a uniform 25-mT magnetic field if the maximum value of the induced emf is to equal 8.6 V?
a. 0.20 Hz b. 2.2 Hz c. 4.9 Hz d. 31 Hz e. 0.031 Hz