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In: Physics

SIX quick question! thankyou SO MUCH 1. A plastic rod, initially uncharged, is rubbed with wool...

SIX quick question! thankyou SO MUCH

1.

A plastic rod, initially uncharged, is rubbed with wool that is also uncharged and obtains a charge of -10 C. What is the charge on the wool after rubbing?

	A.	Unable to be determined.
	B.	-10 C
	C.	0 C
	D.	10 C

2.

You observe a vibrating string that is anchored between two walls to have seven modes. How many antinodes does the string have?

	A.	6
	B.	8
	C.	7
	D.	None. The mode of a wave does not correspond to antinodes.

3

What is alike when the term "two like charges" is used?

	A.	The particles have the same size.
	B.	The particles have the same charge.
	C.	The particles have the same mass.
	D.	The particles have the same weight.

4

How do two differently signed charges interact?

	A.	They repel one another.
	B.	Depends on the distance between them.
	C.	Depends on their magnitudes.
	D.	They attract one another.

5Two sources produce identical sound waves. If one of the sources produced sound that is completely out of phase with the other, what would be the beat frequency you hear?

	A.	Depends on the path length difference between the two sources.
	B.	You would not hear any beats.
	C.	Depends on the distance between the two sources.
	D.	Depends on the speed of the sound.

6

For an infinite sheet of positive charge, the electric field lines:

	A.	are parallel to the sheet of charge and point right.
	B.	are parallel to the sheet of charge and point left.
	C.	are perpendicular to the sheet of charge and point away from the sheet.
	D.	are perpendicular to the sheet of charge and point toward the sheet.

Expert Solution

1. Charges are conserved. While rubbing uncharged plastic rod with uncharged wool, electrons from the plastic rod flows to the wool making it having a charge of -10C. Since the total charge of the system is conserved, the charge on wool will be +10C.

Answer: 10C

2. For longitudinal vibrations, if the mode of vibration is represented as 'n'. Then the number of antinode is also equal to n.

Hence if the mode of vibration is 7, the number of antinodes will also be equal to 7.

Answer : 7

3. Like charges means same charge.

Answer: The particles have same charge.

4. Opposite signed charges always attract each other while same signed charges repel each other.

Answer: They attract one another.

5. Identical sound waves have identical frequencies. If they are out of phase with each other, then the beat frequency (which is the difference between individual frequencies ) will be equal to zero.

Answer : You would not hear any beats.

6. For a sheet of charges, the electric field lines are perpendicular to the sheet. For a positive charge, the electric field lines are radially away from it. Hence for an infinite sheet of positive charge, the electric field lines are perpendicular to the sheet of charge and point away from the sheet.

Answer : are perpendicular to the sheet of charge and point away from the sheet.

genius_generous answered 2 years ago

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