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Murrr4er [49]
4 years ago
8

Make the following conversion. 0.0097 mg = _____ g

Physics
2 answers:
Cloud [144]4 years ago
8 0
Your answer should be 9.7 :)
Masteriza [31]4 years ago
8 0

Answer:

<em> 0.0000097 g </em>

Explanation:

A Milligram is a unit of measuring a mass of a body in the metric system. It is equivalent to a thousandth of grams and mg is the symbol of a milligram.

Gram is the unit of mass of a substance in the metric system and it is represented as g.

Calculation

One thousand milligrams amount to one gram and the expression below can be used to convert mg to g;

gram = milligram ÷ 1000

so 0.0097 will amount to;

g = 0.0097 ÷  1000

= 0.0000097 gram

<em>Therefore 0.0097 mg is equivalent to 0.0000097 g</em>

<em />

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What would a series circuit be used for?
igor_vitrenko [27]

Answer:

C

Explanation:

a series circuit would be an odd choice to power a battery or light a lamp when a direct would be much more efficient, and it's not converting types of energy, so C is the best possible answer

6 0
3 years ago
What is the velocity of a jet plane that travels 48 meters East in 4 seconds?
soldier1979 [14.2K]

Answer:

the speed of a jet plane = v = 12 m/s

Explanation:

jet plane that travels 48 meters East in 4 seconds?

<u>use the velocity as distance over time formula = v = d / t</u>

where:

t = 4 sec

d = 48 m

plugin values into the formula

v = <u>  48 m  </u>

        4 sec

v = 12 m/s

therefore,

the speed of a jet plane = v = 12 m/s

8 0
4 years ago
An engine draws energy from a hot reservoir with a temperature of 1250 K and exhausts energy into a cold reservoir with a temper
dimulka [17.4K]

Answer:

The power output of this engine is  P =  17.5 W

The  the maximum (Carnot) efficiency is  \eta_c  = 0.7424

The  actual efficiency of this engine is  \eta _a  = 0.46

Explanation:

From the question we are told that

    The temperature of the hot reservoir is  T_h = 1250 \ K

      The temperature of the cold reservoir  is  T_c  =  322 \ K

     The energy absorbed from the hot reservoir is E_h  = 1.37 *10^{5} \ J

       The energy exhausts into  cold reservoir is  E_c  = 7.4 *10^{4} J

The power output is mathematically represented as

      P  =  \frac{W}{t}

Where t is the time taken which we will assume to be 1 hour =  3600 s  

W is the workdone which is mathematically represented as

      W =  E_h  -E_c

substituting values

       W = 63000 J

So

    P =  \frac{63000}{3600}

    P =  17.5 W

The Carnot efficiency is mathematically represented as

          \eta_c  =  1 - \frac{T_c}{T_h}

         \eta_c  =  1 - \frac{322}{1250}

         \eta_c  = 0.7424

The actual efficiency is mathematically represented as

        \eta _a  =   \frac{W}{E_h}

substituting values

         \eta _a  =  \frac{63000}{1.37*10^{5}}

         \eta _a  = 0.46

     

7 0
4 years ago
11. How can you determine if there is net force acting<br> on an<br> object?
Alisiya [41]

Answer:

Explanation:

Sum all the forces that are acting on the object and what ever the sum is, is what the net force is.

For example if there is a piece of wood sitting on a table the net force would be the sum of the forces that are acting on it, so the force of gravity (which is negative) + the normal force which would equal zero because they are the same value.

7 0
3 years ago
Aluminum rivets used in airplane construction are made slightly larger than the rivet holes and cooled by "dry ice" (solid CO2)
poizon [28]

Answer:

\rm 4.554\ m m.

Explanation:

<u>Given:</u>

  • Initial temperature, \rm T_i=23.0\ ^\circ C=23 + 273.15 = 296.15\ K.
  • Final temperature, \rm T_f = -78.0\ ^\circ C = -78+273.15=195.15\ K.
  • Diameter of the hole, \rm d = 4.500\ m = 4.500\times 10^{-3}\ m.
  • Expansion coefficient of the Aluminum, \rm \alpha = 2.4\times 10^{-5}\ K^{-1}.

Let the diameter of the rivet at \rm T_i=23.0\ ^\circ C be \rm d_o, such that,

\rm d_o=d+\Delta d

\rm \Delta d is the elongation in the diameter of the rivet.

We know, The change in the diameter of the rivet is related with the change in temperature as:

\rm \dfrac{\Delta d}{d_o}=\alpha \Delta T.

where, \rm \Delta T is the change in temperature = \rm T_f-T_i=-195.15-296.15=-491.30\ K.

Also, \rm \Delta d=d_o-d.

Using these values,

\rm \dfrac{d_o-d}{d_o}=\alpha \Delta T\\1-\dfrac{d}{d_o}=\alpha \Delta T\\\dfrac{d}{d_o}=1+\alpha \Delta T\\\Rightarrow d_o = \dfrac{d}{1+\alpha \Delta T}\\=\dfrac{4.500\times 10^{-3}}{1+2.4\times10^{-5}\times (-491.30)}\\=4.554\times 10^{-3}\ m.\\=4.554\ m m.

It is the required diameter of the rivet at -78.0\ ^\circ C.

4 0
3 years ago
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