Ask question

Ask question

All categories

3 years ago

10

what is the difference in the charges on a balloon rubbed in your hair and a glass rod rubbed with silk? why?

1 answer:

lbvjy [14]3 years ago

8 0

The balloon steals electrons from your hair, leaving the hair positively charged, and the balloon negatively charged. It causes the hair to be apart from each other, because they have the same charge. Glass has a weaker hold on electrons, and silk absorbs the lost electrons.

You might be interested in

If a substance has a high specific heat, is it easy or difficult to change the temperature of that

zmey [24]

It's difficult because the temperature is obviously maintained well if it's designated a specific heat.

7 0

4 years ago

As more and more bulbs are connected in series to a flashlight battery, what happens to the brightness of each bulb? Assuming th

balu736 [363]

Answer:

$P_1 = P_2 = \frac{P}{2}$

so each bulb brightness becomes half of its given or indicated power

$P_1 = P_2 = \frac{V^2}{R}$

so both bulb will glow same power as indicated

Explanation:

Let the indicated power on the bulbs is given as P and its rated voltage is V

so here resistance of each bulb is given as

$R = \frac{V^2}{P}$

now if the two bulbs are connected in series so we will have

$R_{eq} = R_1 + R_2$

$R_{eq} = 2\frac{V^2}{P}$

now the current in the circuit is given as

$i = \frac{V}{R_{eq}$

$i = \frac{P}{2V}$

now brightness of each bulb is given as

$P_1 = P_2 = i^2 R$

$P_1 = P_2 = \frac{P}{2}$

so each bulb brightness becomes half of its given or indicated power

Now if the two bulbs are connected in parallel

then the net voltage across each bulb is "V"

so we will have

$P_1 = P_2 = \frac{V^2}{R}$

so both bulb will glow same power as indicated

6 0

4 years ago

What is the velocity of an 500- kilogram elevator that has 4000 joules of energy

vlada-n [284]

$\frac{1}{2}$ (500kg) × $v^{2}$ = 4000J

V = √(4000 ÷ 250) = 4 m/s

8 0

4 years ago

Which two staments explain how a cell's parts help it get nutrients

Goryan [66]

Answer:

I think it's A and D.

6 0

3 years ago

How much work is done against gravity when lifting a 2-kg sack of groceries a distance of 2.5 meters?

Crazy boy [7]

W = F x d/x = (m x Ag) x h, therefore, mass (2kg x 9.8) x 2.5m = 49J

8 0

3 years ago