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4 years ago

Poor precision in scientific measurement may arise from

1 answer:

7 0

<span>Based on the experience of the responder, to correctly calculate measurements in real-world. Firstly is to avoid errors as much as possible. Errors are what makes your measurement invalid and unreliable. There are two types of error which is called the systematic error and the random error. Each error has different sources. Words that were mentioned –invalid and unreliable are very important key aspects to determine that your measure is truly accurate and consistent. Some would recommend using the mean method, doing three trials in measuring and getting their mean, in response to this problem.</span>

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find the mass of an object which is acted upon by a force of 650 n to produce an acceleration of 10m/ s2

Andreas93 [3]

Answer:

Explanation:

Mass = 650/10 = 65

7 0

3 years ago

How can environmental pollution occur when using cosmetics that contain environmental pollution?

Eduardwww [97]

Answer:

When cosmetics companies use chemicals to make their products, they could dump their waste into rivers and oceans, causing water pollution to occur. The wildlife that lives in these habitats will probably die from them, causing some species to die out and become extinct.

Explanation:

Also, greenhouse gases could be released into the atmosphere, which would cause global warming.

6 0

3 years ago

A 5-gal, cylindrical open container with a bottom area of 120 square inches is filled with glycerin and rests on the floor of an

aleksandrvk [35]

Answer:

a) 68.9 b/ ft²

b) 57.416

Explanation:

Volume of the cylindrical open container V = 5 gal

= (5)(231)

= 11155 in³

different diagrammatic expression has been shown in the attached file below for clear understanding.

Area A = 120 in²

V = hA

= $\frac{1155}{120}$

= 9.625 in

Upward acceleration , $a_z= 3ft/s^2$

$\frac{dp}{dz} = \rho (g + a_z)$

$dp= -\rho (g + a_z)dz$

$\int\limits^P}_0 \,dp= -\rho (g + a_z) \int\limits^0_h \, dz$

$P_b =$ $-\rho (g + a_z) h$

$= (2.4)*(32.2+3) (\frac{9.625}{12})$

= 68.9 b/ ft²

b) The flowchart for the resultant force is shown in the diagram below:

with that:

$F_f = P_bA$

$F_f =\frac{(68.9)(120)}{(144)}$

$F_f =57.416$

Thus, the resultant force that the container exert on the floor of the elevator during this acceleration = 57.416

5 0

3 years ago

The area of a telescope lens is 6507 x 10^3 mm^2. What is the area in square feet, enter your answer in scientific notation. If

scoray [572]

Answer: the area of the telescope lens is \textit{0,08507 ft}

Explanation: Happy I could help!

8 0

3 years ago

A student reacts 20.0 grams of sodium hydroxide with excess hydrochloric acid, and obtains a

Tcecarenko [31]

Answer:

Percent yield of NaCl = 87.75 %

Explanation:

Data given

mass of sodium = 20.0 g

actual yield of Sodium chloride = 25 g

percent yield of sodium chloride = ?

Reaction Given:

NaOH + HCI --> NaCl + H₂O

Solution:

First we have to find theoretical yield.

So, Look at the reaction

NaOH + HCI ---------> NaCl + H₂O

1 mol 1 mol

As 1 mole of NaOH give 1 mole of NaCl

Convert moles to mass

molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

molar mass of NaCl = 23 +35.5 = 58.5 g/mol

Now

NaOH + HCI ---------> NaCl + H₂O

1 mol (40 g/mol) 1 mol (58.5 g/mol)

40 g 58.5 g

So 40 g of NaOH gives 58.5 g of NaCl so how many grams of Sodium chloride will be produced by 20 g of NaOH.

Apply Unity Formula

40 g of NaOH ≅ 58.5 g of NaCl

20 g of NaOH ≅ X g of NaCl

Do cross multiply

g of NaCl = 58.5 g x 20 g / 40 g

g of NaCl = 29.25 g

So the Theoretical yield of NaCl = 29.25 g

Now Find the percent yield of NaCl

Formula Used

percent yield = actual yield /theoretical yield x 100 %

Put value in the above formula

percent yield = 25 / 29.2 x 100 %

percent yield = 87.75 %

percent yield of NaCl = 87.75 %

7 0

4 years ago