2 years ago

How does the digestive system help the muscular system?

Physics

1 answer:

Sveta_85 [38]2 years ago

8 0

Answer:

I would say the answer is A... but I'm not so sure ....

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Two charged spheres are 20 cm apart and exert an attractive force of 8 x 10-9 n on each other. What will the force of attraction

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Answer:

$3.2\cdot 10^{-8} N$

Explanation:

The inital electrostatic force between the two spheres is given by:

$F=k\frac{q_1 q_2}{r^2}$

where

$F=8\cdot 10^{-9} N$ is the initial force

k is the Coulomb's constant

q1 and q2 are the charges on the two spheres

r is the distance between the two spheres

The problem tells us that the two spheres are moved from a distance of r=20 cm to a distance of r'=10 cm. So we have

$r'=\frac{r}{2}$

Therefore, the new electrostatic force will be

$F'=k\frac{q_1 q_2}{(r')^2}=k\frac{q_1 q_2}{(r/2)^2}=4k\frac{q_1 q_2}{r^2}=4F$

So the force has increased by a factor 4. By using $F=8\cdot 10^{-9} N$ , we find

$F'=4(8\cdot 10^{-9} N)=3.2\cdot 10^{-8} N$

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letter B. and A. im not sure.

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A new business should be based on an entrepreneur's individual interests because the entrepreneur must have sufficient confidenc

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Knowing that a 0.90-kg object weighs 9.0 N , find the acceleration of a 0.90-kg stone in free fall . Express your answer to two

sasho [114]

Answer:

The value of acceleration of a stone in free fall is $10\ m/s^2$ .

Explanation:

Given that,

Mass of the object, m = 0.9 kg

Weight of the object, W = 9 N

We need to find the acceleration of a stone in free fall. The weight of an object is given by :

W = mg

g is the acceleration of the stone in free fall

So, $g=\dfrac{W}{m}$

$g=\dfrac{9\ N}{0.9\ kg}$

$g=10\ m/s^2$

So, the value of acceleration of a stone in free fall is $10\ m/s^2$ . Hence, this is the required solution.

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