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4 years ago

5

Please help with this science question and please explain if you can! I'm so confused

1 answer:

forsale [732]4 years ago

8 0

In this experiment, the independent variable is the surface, the dependant variable is the distance one end of the surface must be lifted to see movement of the object, and the control variable is the object. Since the surface height at one end is changed and the object is kept the same, the only conclusion that can be made is whether the surface has an effect on the force of friction. Of course, basic physics tells you that it does, therefore A is correct.

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A 3.4kg aluminium ball has an apparent mass of 2.10kg when submerged in a particular liquid. Calculate the density of the liquid

Shalnov [3]

Answer:

1083.3kg/m ³

Explanation:

Given parameters:

Mass of aluminium ball = 3.4kg

Apparent mass of ball = 2.1kg

Unknown:

Density of the liquid = ?

Solution:

Density is is the mass per unit volume of any give substance;

Density = $\frac{mass}{volume}$

Now, we must understand that the apparent weight of the aluminium is the part of its weight supported by the fluid;

Pl = $\frac{Ml}{Vl}$

Pl = density of liquid

Ml = mass of liquid

Vl = volume of liquid

Mass of liquid = Mal - Mapparent

Mal = mass of aluminium

The volume of liquid displaced is the same as the volume of the aluminium according to Archimedes's principle;

Ml = Pl x Vl

Val = Vl

Val volume of aluminium

Vl = volume of liquid

****

Pal = $\frac{Mal}{Val}$

Val = $\frac{Mal}{Pal}$

Val = volume of aluminium

Mal = mass of aluminium

Pal = density of aluminium

*****

Since the Val = Vl

Ml = Pl x $\frac{Mal}{Pal}$

Since

Ml = Mal - Mapparent

Mal - Mapparent = Pl x $\frac{Mal}{Pal}$

Pal = density of aluminium = 2712 kg/m ³

3.4 - 2.1 = Pl x $\frac{3.4}{2712}$

1.3 = Pl x 0.00123

Pl = 1083.3kg/m ³

5 0

3 years ago

What is the relationship between increase speed of a car and energy in a<br> collision?

sweet [91]

The relationship between a car and energy is that the car uses gas to produce speed within energy needs to be powered

6 0

3 years ago

Read 2 more answers

You raise a bucket of water from the bottom of a deep well. if your power output is 138 w , and the mass of the bucket and the w

inn [45]

Maybe 34.5

I'm not quite sure

8 0

4 years ago

A student performs an experiment in which a 4kg object travels across a horizontal surface with an initial speed velocity of 6m/

Snezhnost [94]

Answer:

The velocity of the center of mass of the two-object system remains constant during the experiment.

5 0

3 years ago

Part CPart complete Determine the maximum force P that can be applied without causing the two 43-kg crates to move. The coeffici

Wewaii [24]

Answer:

the maximum force will be equal to 134.84 N

Explanation:

We have given mass m = 43 kg

Coefficient of static friction $\mu _s=0.32$

Acceleration due to gravity $g=9.8m.sec^2$

We have to find the maximum force which , when applied there is no movement of crates

This maximum force will be equal to frictional force

Frictional force is given by $f=\mu mg=0.32\times 43\times 9.8=134.84N$

So the maximum force will be equal to 134.84 N

3 0

3 years ago