All categories

3 years ago

How many electrons are there in 3.5 x 10" C?

Physics

1 answer:

Masja [62]3 years ago

4 0

Answer:

$2.19\cdot 10^{20}$ electrons

Explanation:

I assume you mean:

How many electrons are there in $3.5\cdot 10^{1}C$ ?

Solution:

The charge of one electron is (in magnitude)

$e=1.6\cdot 10^{-19}C$

The charge in this problem is

$Q=3.5\cdot 10^{1} C$

So, we can find how many electrons are in this charge by simply dividing the total charge by the charge of one electron:

$n=\frac{Q}{e}=\frac{3.5\cdot 10^{1}}{1.6\cdot 10^{-19}}=2.19\cdot 10^{20}$

You might be interested in

A spring is stretched from x=0 to x=d, where x=0 is the equilibrium position of the spring. It is then compressed from x=0 to x=

VARVARA [1.3K]

Answer:

The same amount of energy is required to either stretch or compress the spring.

Explanation:

The amount of energy required to stretch or compress a spring is equal to the elastic potential energy stored by the spring:

$U=\frac{1}{2}k (\Delta x)^2$

where

k is the spring constant

$\Delta x$ is the stretch/compression of the spring

In the first case, the spring is stretched from x=0 to x=d, so

$\Delta x = d-0=d$

and the amount of energy required is

$U=\frac{1}{2}k d^2$

In the second case, the spring is compressed from x=0 to x=-d, so

$\Delta x = -d -0 = -d$

and the amount of energy required is

$U=\frac{1}{2}k (-d)^2= \frac{1}{2}kd^2$

so we see that the amount of energy required is the same.

7 0

4 years ago

A boat radioed a distress call to a Coast Guard station. At the time of the call, a vector A from the station to the boat had a

VashaNatasha [74]

Answer:

d = 39.7 km

Explanation:

initial position of the boat is 45 km away at an angle of 15 degree East of North

so we will have

$r_1 = 45 sin15 \hat i + 45 cos15 \hat j$

$r_1 = 11.64 \hat i + 43.46\hat j$

after some time the final position of the boat is found at 30 km at 15 Degree North of East

so we have

$r_2 = 30 cos15\hat i + 30 sin15 \hat j$

$r_2 = 28.98\hat i + 7.76 \hat j$

now the displacement of the boat is given as

$d = r_2 - r_1$

$d = (28.98\hat i + 7.76 \hat j) - (11.64 \hat i + 43.46\hat j)$

$d = 17.34 \hat i - 35.7 \hat j$

so the magnitude is given as

$d = \sqrt{17.34^2 + 35.7^2}$

$d = 39.7 km$

4 0

3 years ago

Who else got stuck on a question and is NOT ready for test return at 2? its 1:58 AAAAAAA

k0ka [10]

Good luckkkk hope you do well

3 0

3 years ago

A material that can easily flow is called aa. fluid.

Fiesta28 [93]

I'm pretty sure it would be A. As fluids are able to move and flow pretty easily.

7 0

3 years ago

What is electrical resistivity? What is its unit? Describe an experiment to study the factors on which the resistance of conduct

krok68 [10]

Electrical resistance is an objects ability to resist or oppose current which means its resistance is defined as ohms since that is the person who discovered it. And an experiment to study this would be a multimeter in a circuit testing current and change the material of the wire allowing you to see the change in current due to change in resistance

5 0

3 years ago