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4 years ago

Mercury is the 80th position in the periodic table how many protons does it have

Physics

2 answers:

krek1111 [17]4 years ago

8 0

Mercury has 80 protons.

Hope this helped!

snow_lady [41]4 years ago

4 0

Errrrr, it has 80.

80 is the correct answer

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if A and B are non zero vectors, is it possible for vector A×vector B and vector A.vector B both to be zero? Justify your answer

DedPeter [7]

Answer:

not able to understand the question

3 0

3 years ago

A box of bananas weighing 40.0 N rests on a horizontal surface. The coefficient of static friction between the box and the surfa

nataly862011 [7]

Answer:

a) $f=0\ N$

b) $f=6\ N$

c) $F=16\ N$

d) $a=2.45\ m.s^{-2}$

Explanation:

Given:

weight of the box on the horizontal surface, $w=40\ N$

coefficient of static friction between the surface and the box, $\mu_s=0.2$

coefficient of kinetic friction between the surface and the box, $\mu_k=0.2$

When no horizontal force acts on the box then according to the Newton's first law of motion there will be no any force of friction acting on the body but just a vertical component is balanced by the normal reaction.

Now force on the box, $F=6\ N$

So there we have the maximum force of static friction as:

$f_s=\mu_s.N$

here:

N = normal force equal to the weight of the body

$f_s=0.4\times 40$

$f_s=16\ N$

Now the magnitude of the static frictional force is equal to the applied force on the box. So,

$f=6\ N$

Since we have the maximum static frictional force between the two surfaces as:

$f_s=16\ N$

So, the applied force must be equal to this limiting value.
So the applied force must be:

$F=16\ N$

Now when the box has started its motion then the minimum intensity of the force to keep the box moving is equals to the kinetic frictional force:

$F_k=\mu_k.N$

$F_k=0.2\times 40\\F_k=8\ N$

The value of friction force:

Since the box is moving, so the maximum friction is the kinetic friction:

$F_k=8\ N$

The applied force is :

$F=18\ N$

So the acceleration will be due to :

$\Delta F=F-F_k$

$\Delta F=10\ N$

now we know that:

$a=\frac{\Delta F}{m}$

$a=10\div\frac{40}{9.8}$

$a=2.45\ m.s^{-2}$

8 0

3 years ago

Obviously, everybody has different skill sets. The goal of this lesson is not to become an Olympic volleyball player. Instead, i

mr Goodwill [35]

'What did you find most challenging about mastering this skill?'

Ahh- What I found most challenging about the passing skill is hitting the ball the right direction. The last time I tried to pass the ball it hit someone in the face. But when I got a hang of it, It was easy until middle game. I tried to hit the ball and I faceplanted into the bar..-

'What did you find easiest about mastering this skill?'

The easiest? Well for me, nothing was easy. I couldn't even serve the ball without hitting it thw wrong direction!! I can't serve or pass a ball without it going the wrong direction or the ball hitting someone in the face! It gotten easier and easier as the game went particuallarly well. My team did end up winning thanks to one of my teammates. I can't play volleyball well at all. It was easy in some cases but hard at the same time.

Hope this helps you! :)

5 0

3 years ago

Read 2 more answers

Which statement is true according to Newton's first law of motion?

katrin2010 [14]

C) In the absence of an unbalanced force, an object at rest will stay at rest and an object in motion will stay in motion.

hope this helps and have a great day :)

8 0

3 years ago

Read 2 more answers

Statement A: Area of a rectangle with measured length = 2.536 m and width = 1.4 m. Statement B: Area of a rectangle with measure

Sholpan [36]

Answer:

Statement A=3.5504m²

Statement B=3.57576m²

Explanation:

The area of a rectangle is gotten by multiplying the length of the rectangle by the width of the rectangle which gives us the surface area which the rectangle covers. For statement A, I multiplied 2.536 by 1.4 and for statement B, I multiplied 2.536 by 1.41

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3 years ago