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alukav5142 [94]
3 years ago
7

In an experiment the mass of a calorimeter is 36.35 g . Express in micrometer ,millimetre and kg.

Physics
1 answer:
Andru [333]3 years ago
4 0

Answer:

1. 36.35 g = 36.35E15 micrometer.

II. 36.35 g = 363.5 millimetre.

III. 36.35 g = 0.03635 kilogram.

Explanation:

<u>Given the following data;</u>

  • Mass of calorimeter = 36.35 grams

To convert the mass in grams (g) to;

I. Micrometer

<u>Conversion:</u>

1 g = 1 exp 15 um

36.35 g = X um

Cross-multiplying, we have;

X = 36.35 * 1 exp 15 = 36.35 exp 15 um

<em>36.35 g = 36.35E15 micrometer</em>

II. Millimetre

<u>Conversion:</u>

1 g = 1 milliliter

36.35 g = X milliliter

Cross-multiplying, we have;

X = 36.35 * 1 = 36.35 milliliter

Next, we would convert milliliter to millimetre;

1 milliliter = 10 millimetre

36.35 milliliter = X millimetre

Cross-multiplying, we have;

X = 36.35 * 10 = 363.5 millimetre

<em>36.35 g = 363.5 millimetre</em>

III. Kilogram

<u>Conversion:</u>

1000 grams = 1 kilogram

36.35 g = X kilogram

Cross-multiplying, we have;

X * 1000 = 36.35 * 1

Dividing both sides by 1000, we have;

X = 36.35/1000 = 0.03635 kilogram

<em>36.35 g = 0.03635 kilogram</em>

<u>Note:</u>

  • g is the symbol for grams.
  • Exp (E) means exponential = 10
  • um is the symbol for micrometer.
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The Newton's law of cooling is:
T(x) = Ta + (To - Ta)e⁻ⁿˣ

T(x) - the temperature of the coffee at time x
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step 1. Calculate constant k:

We have:
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x = 10 min
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T(x) = Ta + (To - Ta)e⁻ⁿˣ
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Step 2. Calculate time x when T(x) = 180°F:
We have:
T(x) = 180°F
x = ?
Ta = 68°F
To = 210°F
n = 0.007

T(x) = Ta + (To - Ta)e⁻ⁿˣ
180 = 68 + (210 - 68)e⁻⁰.⁰⁰⁷*ˣ
180 - 68 = 142 * e⁻⁰.⁰⁰⁷*ˣ
112 = 142 * e⁻⁰.⁰⁰⁷⁾*ˣ
e⁻⁰.⁰⁰⁷*ˣ = 112/142
e⁻⁰.⁰⁰⁷*ˣ = 0.79

Logarithm both sides with natural logarithm:
ln(e⁻⁰.⁰⁰⁷*ˣ) = ln(0.79)
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Explanation:

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(a)  Now, we will calculate the electric potential as follows.

             V = k \frac{q}{r}

First, we will calculate the initial and final electric potential as follows.

    V_{i} = 9 \times 10^{9} \times \frac{5.90 \times 10^{-3}}{0.25 m}      

                = 212.4 \times 10^{6}

or,             = 2.124 \times 10^{8}

V_{f} = 9 \times 10^{9} \times \frac{1.70 \times 10^{-3}}{0.35 m}      

                = 43.71 \times 10^{6}

or,             = 4.371 \times 10^{8}

Hence, the value of change in electric potential is as follows.

              \Delta V = V_{f} - V_{i}

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Therefore, the difference in electric potential energy is 2.247 \times 10^{8} V.

(b)  Now, we will calculate the potential energy as follows.

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Therefore, the change in the system's electric potential energy is -3.8199 \times 10^{5}.

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If the force moving an object points at least partially in the opposite direction of the objects motion, the work is considered to be negative.

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This is because, in this case the external force is helping the object to continue its state of motion. So, if the force acting on the object is in completely opposite or partially opposite direction to the direction of motion of the object, it will stop or slow down the motion of the object.

This kind of force will have negative direction to the motion of the object and hence the work done will also be negative.

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