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ollegr [7]
3 years ago
15

What is power?

Physics
2 answers:
hammer [34]3 years ago
4 0
We can define power as the rate of doing work, it is the work done in unit time. The SI unit of power is Watt (W) which is joules per second (J/s). Sometimes the power of motor vehicles and other machines are given in terms of Horsepower (hp) which is approximately equal to 745.7 watts.


Power is the rate at which a force is applied to an object for example.current wire
Snowcat [4.5K]3 years ago
4 0

Answer:

Power is the rate at which a force is applied to an objec

Explanation:

^-^

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1. A 2000kg truck at rest accelerates to 45m/s in 7 seconds. What is its change in kinetic energy?
Gemiola [76]

Answer:

2025000 J

Explanation:

The formula for kinetic energy is KE=.5(m)(v²).  

The initial kinetic energy is 0 because it is at rest.  .5(m)(0) = 0.

To calculate the final kinetic energy, use the kinetic energy equation. KE = .5(2000)(45²) = 2025000 J.

To find the change in kinetic energy, you do KE(f) - KE(i).  2025000-0 = 2025000 J.

5 0
4 years ago
What is the wavelength of red light in vacuum that has a frequency of 4.00 × 1014 hz?
Pachacha [2.7K]

Answer: 7.5(10)^{-7} m

Explanation:

The frequency \nu of an electromagnetic wave is given by the following equation:  

\nu=\frac{c}{\lambda}  

Where:  

c=3(10)^{8} m/s is the speed of light  in vacuum

\nu=4(10)^{14} Hz is the frequency of red light

\lambda   is the wavelength of red light

Isolating \lambda:

\lambda=\frac{c}{\nu}  

\lambda=\frac{3(10)^{8} m/s}{4(10)^{14} Hz}  

Finally:

\lambda=7.5(10)^{-7} m  

6 0
4 years ago
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sertanlavr [38]
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On a cold winters day, if you left a drink setting outside, it could freeze because the heat (related to the kinetic energy) of the atoms in the drink will be transferred to the environment to achieve energy equilibrium. 

Heat transfer occurs by various mechanisms, flowing from the hottest body to the coldest, that's why the heat goes from the drink, which has a higher temperature (and kinetic energy) to the environment, which has a lower temperature. This is described by the second law of thermodynamics
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Answer:

Explanation:

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