6. To which of these abrasive disks can you

What fraction of all the electrons in a 25 mg water

mihalych1998 [28]

Answer:

$9.11\times 10^{-15}.$

Explanation:

The water droplet is initially neutral, it will obtain a 40 nC of charge when a charge of -40 nC is removed from the water droplet.

The charge on one electron, $\rm e=-1.6\times 10^{-19}\ C.$

Let the N number of electrons have charge -40 nC, such that,

$\rm Ne=-40\ nC\\\Rightarrow N=\dfrac{-40\ nC}{e}=\dfrac{-40\times 10^{-9}\ C}{-1.6\times 10^{-19}\ C}=2.5\times 10^{11}.$

Now, mass of one electron = $\rm 9.11\times 10^{-31}\ kg.$

Therefore, mass of N electrons = $\rm N\times 9.11\times 10^{-31}=2.5\times 10^{11}\times 9.11\times 10^{-31}=2.2775\times 10^{-19}\ kg.$

It is the mass of the of the water droplet that must be removed in order to obtain a charge of 40 nC.

Let it is m times the total mass of the droplet which is $25\ \rm mg = 25\times 10^{-6}\ kg.$

Then,

$\rm m\times (25\times 10^{-3}\ kg) = 2.2775\times 10^{-19}\ kg.\\m=\dfrac{2.2775\times 10^{-19}\ kg}{25\times 10^{-3}\ kg}=9.11\times 10^{-15}.$

It is the required fraction of mass of the droplet.

3 0

3 years ago

Can yall answer this? (for class) whats the diffrentce between drug addict and acoholic?

lora16 [44]

Answer:none

Explanation:

8 0

3 years ago

Quan sát sóng dừng trên sợi dây dài 60cm cố định hai đầu, thấy có 3 nút (bao gồm cả hai

stiks02 [169]

Answer:

Quan sát sóng dừng trên sợi dây dài 60cm cố định hai đầu, thấy có 3 nút (bao gồm cả hai

nút hai đầu) và 2 bụng. Bước sóng của sóng lan truyền trên sợi dây là:

7 0

3 years ago

A series circuit has a current of 5 A. The circuit contains 10ohms resistor. What is the voltage of the circuit

d1i1m1o1n [39]

Answer:

50 Volts

Explanation:

Using Ohm's Law

V= I x R

V= 5 x 10

V = 50 V

3 0

3 years ago

John does 3.2J of work to lower the window shade in her bedroom a distance of 0.8m. How much force must John exert on the window

Gekata [30.6K]

Answer:

$\boxed {\boxed {\sf 4 \ Newtons}}}$

Explanation:

Work is energy transferred when an object is moved. It is the product of force and distance.

$W= F*d$

John did 3.2 Joules of work or 3.2 Newton meters of work (the units are equivalent). The window shade was lowered a distance of 0.8 meters.

W=3.2 N*m
d= 0.8 m

Substitute the values into the formula.

$3.2 \ N *m = F * 0.8 \ m$

We are solving for the force, so we must isolate the variable F. It is being multiplied by 0.8 meters. The inverse operation of multiplication is division, so divide both sides of the equation by 0.8 m.

$\frac {3.2 \ N*m}{0.8 \ m}= \frac{ F* 0.8 \ m}{0.8 \ m}$

The units of meters cancel.

$\frac {3.2 \ N}{0.8 }=F$

$4 \ N = F$

John must exert <u>4 Newtons of force.</u>

4 0

3 years ago