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ella [17]
3 years ago
12

Most moving objects change speed or direction at some point because _____ forces exist nearly everywhere. A. net B. normal C. ba

lanced D. unbalanced
Physics
2 answers:
dangina [55]3 years ago
8 0

The answer is D. Unbalanced

This is because in order to change the speed or direction of an object, unbalanced forces need to be working on it.

Hope that helps! :)

Harman [31]3 years ago
5 0

D. Unbalanced

Good Luck


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In this wave, there is a vertical line which represents what part of the wave?
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Answer:Height

Explanation:

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3 years ago
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A liquid with a mass of 75 g is at its boiling point. It completely boils off when AQ = 15000000) of heat energy is added to it.
aev [14]

Answer:

2 × 10⁸J/kg

Explanation:

Specific latent heat of vaporization (steam)  is the quantity of heat required or needed to change a unit of mass of liquid to gaseous state at constant temperature (boiling point) and pressure.

It can be calculated mathematically using,

Q = mL

Where,  Q = quantity of heat

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L = specific latent heat (J/kg)

Therefore,from the question

Q= 15000000J

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L = 15000000  ÷ 0.075

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I hope this was helpful, please mark as brainliest

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3 years ago
5. Work is being done when a force
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An inventor claims to have developed a food freezer that, in steady-state conditions, requires a power input of 0.25 kW to extra
WARRIOR [948]

Answer:

The inventors  claim is not real

a)  No the the freezer cannot operate in such conditions

Explanation:

From the question we are told that

     The  power input is  P_i  = 0.25 kW  =  0.25 *10^{3} \ W

      The  rate of heat transfer J  =  3050 J/s

       The temperature of the freezer content is T = 270 \ K

       The  ambient temperature is  T_a  =  293 \ K

Generally the coefficient of performance of a refrigerator at idea conditions is mathematically represented as

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substituting values

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     COP  =11.7

Generally the coefficient of performance of a refrigerator at real conditions is mathematically represented as

       COP  =  \frac{J}{P_i}

substituting values

       COP  =  \frac{3050}{0.25 *10^{3}}

       COP  = 12.2

Now given that the COP  of an ideal refrigerator is  less that that of a real refrigerator then the claims of the inventor is rejected

This is because the there are loss in the real refrigerator cycle that are suppose to reduce the COP compared to an ideal refrigerator cycle where there no loss that will reduce the COP

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3 years ago
which wave behavior results from two waves colliding and the temporary combined wave reaults in a smaller wave than the original
choli [55]
Destructive interference is the answer
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