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3 years ago

As you sit in a chair, in what direction (or directions) do you exert an action force?

2 answers:

5 0

As we sit in a chair, Action force will be only in one direction and that direction would be downward only.

In short, Your Answer would be Option A

Hope this helps!

charle [14.2K]3 years ago

4 0

Answer:

a. downward only

Explanation:

I just took the quiz! :)

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How much energy does it take to melt a 16.87 g ice cube? ΔHfus = 6.02 kJ/mol How much energy does it take to melt a 16.87 g ice

Vilka [71]

Answer:

How much energy does it take to melt a 16.87 g ice cube? ΔHfus = 6.02 kJ/mol How much energy does it take to melt a 16.87 g ice cube? = 6.02 kJ/mol

A. 108 kJ

B. 102 kJ

C. 5.64 kJ

D. 936 kJ

E. none of the above

<em>5.64 kJ</em>

Explanation:

The Heat of fusion is the heat energy required to dissolve a given mass of ice at melting point.

<h3>Step by Step Calculation</h3>

The heat energy required to dissolve ice can be calculated using the expression below;

Q = ΔH $_{f}$ x m ...............................................1

where Q is the heat energy required;

ΔH $_{f}$ is the heat of fusion for ice;

m is the mole

All the parameters above are provided in the question except m, so to get m we use the molar mass of water (also for ice) which is 18.01528 g/mol .

<em>This means that 18.01528 g of ice is contained in one mole, therefore the mole for 16.87 g of ice is given as;</em>

$m = \frac{16.87g}{18.015g/mol}$

m = 0.9364 mole of ices

Now the parameters are complete, we are given;

ΔH $_{f}$ = 6.02 kJ/mol

m = 0.9364 mol

Q =?

Substituting into equation 1, we have

Q = 6.02 kJ/mol x 0.9364 mol

Q = 5.64 kJ

<em>Therefore, the energy required to melt 16.87 g of ice is 5.64 kJ</em>

5 0

3 years ago

What is the gain in gravitational potential energy of a body of weight 2000N as it rises from a height of 20m to a height of 25

monitta

Answer:

Explanation:

GPE =weight * height

= 2000*(25-20)

= 10000 J

8 0

3 years ago

Please answer of this question

Bogdan [553]

Answer:

$\frac{\pi }{15}$ m

Explanation:

At 10am, the minute hand and hour hand are ' 2 hours apart', since the minute hand is at 12pm and hour hand is at 10am.

Angle between the two hands = 2/12 * 360

= 60°

Arc Length = $2\pi r(\frac{60}{360} )$

= $2\pi (0.2)(\frac{1}{6} )\\= \frac{\pi }{15} m$

8 0

2 years ago

Which theory explains that cussing in front of your grandparents or hugging a stranger would be okay to you based on social cont

Ainat [17]

Either concrete or cognitive

8 0

3 years ago

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down,

maw [93]

V^2=u^2 +2aS
U is found first by considering that first 8 secs and using v=u+at. {different v and u though}

V=-u+gt.
Magnitude of u = magnitude of v if there is no resistance ( because the conservation of energy says the k. E. must be the same when it passes you as when it left your hand).... up is negative here, down is positive.
V+v=gt
2v= g x 8
V=4xg.= the initial velocity for the next calculation
V^2=(4g)^2+(2xgx21)

So v can be calculated.

4 0

3 years ago