3 years ago

Define what is energy and work

1 answer:

8 0

The work-energy principle states that an increase in the kinetic energy of a rigid body is caused by an equal amount of positive work done on the body by the resultant force acting on that body. Conversely, a decrease in kinetic energy is caused by an equal amount of negative work done by the resultant force.

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3 years ago

A 82-kg skydiver has a speed of 40 m/s at an altitude of 490 m above the ground. Calculate the total mechanical energy of the sk

Sav [38]

Answer:

$ME=459,364J$

Explanation:

Mechanical Energy=Potential Energy+ kinetic Energy

$m=82kg,g=9.8N/kg,h=490m,v=40m/s$

To calculate Kinetic Energy:-

$KE=\frac{1}[2}mv^2\\=\frac{1}{2}\times82kg \times(40m/s)^2\\=65600J$

To calculate Potential Energy:-

$PE=mgh\\=82kg \times9.8N/kg \times490\\=393764$

therefore,

$ME=KE+PE\\=65600+393764\\=459364J$

The skydiver's total mechanical energy is 459365J

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4 years ago

The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 200 Joules of heat(Q) is added to 10 gram

andrew11 [14]

Answer:

7.8 J/g °C

Explanation:

0.39 J/g °C x 200 J / 10g

= 7.8 J/g °C

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4 years ago

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What happen to internal energy of water at 0 degree?

miss Akunina [59]

Answer:

internal energy apparently increases.

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3 years ago

Define what is energy and work​

Define what is energy and work