Jeopardy (CP) Subterm 2 Review Topics Covered: Waves Sound Electrostatics Circuits Magnetism

A cork on the surface of a pond bobs up and down two times per second on ripples having a wavelength of 8.50 cm. What is the cork’s speed?

If the speed of a wave stays the same, what happens to the frequency as the wavelength decreases? The frequency will INCREASE. V=f

Mrs. Wright sings toward a cliff in the mountains and the sound is reflected directly back to her. She is standing 170 m from the natural wall. If her music is traveling through air at 340 m/s, how long will it take Mrs. Wright to hear her own echo?

A rather noisy typewriter produces a sound intensity of 1 x watts/m 2. Find the decibel level of this machine.

During the Macy’s Thanksgiving Day Parade it is 5 o C outside. A late parade watcher drives towards the parade at 15 m/s as the parade marches towards her, at 5 m/s. If one of the bands plays a note of 415 Hz, what frequency will she hear? (assume the speed of sound is 334 m/s at 5 o C)

A 4.00 m long pipe is half way submerged in room temperature water where the speed of sound is 343m/s in the room. What is the fundamental frequency of the pipe? = 4L

What do the electric field lines look like for the following charge:

Two point charges of -1.0 nC and +2.0 nC are separated by a distance of 0.30 m. What is the electric force on each particle? (remember 1nC = 1x10 -9 C)

An uncharged conductor is supported by an insulating stand. A positively charged rod is brought near the left end of the conductor. The you touch the right side of the conductor with your hand. The What is the charge of the conductor now? NEGATIVE

An electric field of 2.0x10 4 N/C is directed along the positive x-axis. What is the electric force on an electron in this field? (Q electron = 1.6x C) Along the negative x-axis

What is the magnitude and direction of the electric field at a distance of 3.20 m from a – 50.0 nC charge?

Two point charges are 4 cm apart. They are moved to a new separation of 2 cm. By what factor does the resulting mutual force between them change? 1)½ 2) 2 3) ¼ 4) 4 5) depends on the charges

Charge A has 10 electric field lines coming out, Charge B has 20 lines coming out, and charge C has 30 lines coming in. Which pair of these charges will have the largest force between them if placed 1 cm apart? Charge A 10 lines Charge B 20 lines Charge C 30 lines

The leaves of a negative electroscope will stick out. What happens to the leaves when another negative rod is brought close to the scope, but does not touch it? More negatives are pushed into the leaves and the leaves stick out even further.

What type of wire makes the best conductor? Long or short Thick or thin Rubber or Aluminum

When resistors are put in series, their overall resistance is a.Larger than that of any individual resistor b.The same as the resistance of one of the resistors c.Smaller than the resistance of any of the resistors a.Larger than that of any individual resistor b.The same as the resistance of one of the resistors c.Smaller than the resistance of any of the resistors

A wire 5.0 m long and 3.0 mm in diameter has a resistance of 100 . A 15 V potential difference is applied across the wire. What is the current in the wire?

What is the resistance of a 100. W light bulb if it is plugged into a 120. V outlet?

Three resistors with resistance of 6 , 12 , and 24  are connected in series. What is the total resistance of the circuit?

What is the same in a parallel circuit?

Three resistors with resistance of 6.0 , 12 , and 24  are connected in series with a 12V battery. What is the current through the 12  resistor? The current is the same through all of them so the total resistance must be used.

What is the current through each of the resistors? (Don’t raise your hand until you have all THREE resistances) 6  12 V / 6  = 2 A 6  12 V / 18  = 0.67 A 12  12 V / 18  = 0.67 A 6  12  6  12 V

What is the direction of the force on the electron?...

What does the magnetic field look like for a loop of wire with a clockwise current as shown? X Into the board inside the loop, out of the board outside the loop

An electron moves with a speed of 7.0 x 10 6 m/s along the +x axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60  to the +x axis and lying in the xy plane. Calculate the magnetic force of the electron.

A proton is released such that its initial velocity is from right to left across this page. The proton's path, however, is deflected (by a force) in a direction toward the bottom edge of the page due to the presence of a uniform magnetic field. What is the direction of this field?

A generator is created by moving a m long wire in an external magnetic field of 5.50 T at a speed of 15.0 m/s. (a) What EMF is produced by the generator? (b) What effective emf if produced by the generator? (a) (b)

Final Jeopardy What is the current in the 10  resistor?