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g100num [7]
3 years ago
8

The kinetic energy of a ball with a mass of 0.5 kg and a velocity of 10 m/s is?

Physics
2 answers:
cestrela7 [59]3 years ago
8 0

<u>Answer:</u> The kinetic energy of the ball is 25 J

<u>Explanation:</u>

Kinetic energy is defined as the energy which is possessed due to its motion.

It is also defined as the half of the product of mass of the object and square of the velocity of the object.

Mathematically,

E_K=\frac{1}{2}mv^2

where,

E_K = kinetic energy of ball  

m = mass of the ball = 0.5 kg

v = velocity of ball = 10 m/s

Putting values in above equation, we get:

E_K=\frac{1}{2}\times 0.5\times (10)^2\\\\E_K=25J

Hence, the kinetic energy of the ball is 25 J

Vlad1618 [11]3 years ago
3 0
KE= .5*M*V^2
.5*.5*10^2
=25Joules
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A heat engine has a maximum possible efficiency of 0.780. If it operates between a deep lake with a constant temperature of-24.8
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Answer : The temperature of the hot reservoir (in Kelvins) is 1128.18 K

Explanation :

Efficiency of carnot heat engine : It is the ratio of work done by the system to the system to the amount of heat transferred to the system at the higher temperature.

Formula used for efficiency of the heat engine.

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

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Now put all the given values in the above expression, we get:

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

0.780=1-\frac{248.2K}{T_h}

T_h=1128.18K

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