Answer:
Density of the sample will be 13.4 kg/L
Explanation:
We have given volume of the sample 
Mass of the sample 
We have to find the density of the sample
Density of the sample is given by
So density of the sample will be 13.4 kg/L
The answer for the following question is explained below.
- <u><em>Therefore the work done is 130 kilo Joules.</em></u>
Explanation:
Work:
A force causing the movement or displacement of an object.
Given:
mass of the person (m) = 65 kg
height of the cliff (h) = 2000 m
To calculate:
work done (W)
We know;
According to the formula:
<u>W = m × g × h</u>
Where;
m represents mass of the person
g represents the acceleration due to gravity
where the value of g is;
<u> g = 10 m/ s²</u>
h represents the height of the cliff
From the above formula;
W = 65 × 10 × 2000
W = 130,000 J
W = 130 Kilo Joules
<u><em>Therefore the work done is 130 kilo Joules.</em></u>
Answer:
Explanation:
The work of force 2 will be given by the vectorial equation 
. We know the value of 
and have information about its movement, which relates to the net force 
.
About this movement we can obtain the acceleration using the equation 
. Since it departs from rest we have 
.
And then using Newton's 2dn Law we can obtain the net force F=ma, thus we will have 
And we had the work done by force 2 as:
(The sign will be given algebraically since we take positive the direction to the right.)
With our values:
<em>Another (shorter but maybe less intuitive way for someone who is learning) way of doing this would have been to say that the work done by both forces would be equal to the variation of kinetic energy:</em>
<em>
</em>
<em>Which leads us to the previous equation straightforwardly.</em>
2: It's not just the capillary action, but the pull from transpiration (the evaporation of water from the tree) that is used to pull water up from the roots.
<span>The second question needs context. Strong bonds alone won't cause tension. I don't see how adhesion is different. High vapour pressure could do it, but it's the difference in pressures that'd cause tension (and the resistance of that pressure by the surface). So, a low and high pressure would be needed. Poorly worded question :( </span>
<span>1: "Adhesion is the tendency of certain dissimilar molecules to cling together due to attractive forces." [1] </span>
<span>3: The other three answere would not work. Think of a boat. </span>
<span>3: If you push gas, it will be compressed(get smaller). If you push liquid it will push something else. Thus, liquids are good for transferring force. This is a hydraulic system.</span>
I think rubbing two pieces of woods together will have more friction than wood rubbing against a smooth metal.
<u>Explanation:</u>
The friction offered by surfaces has a great role in deciding the ease of movement of objects along the surface.
The friction of the surface depends upon its roughness. Rough surfaces offer greater friction than smooth surfaces.
In this question wooden pieces have greater friction than that of smooth metal. So rubbing two wooden pieces together will have greater friction than rubbing a wooden piece against a smooth metal.
