3 years ago

Prove and state law of conservation of energy

Physics

1 answer:

Novay_Z [31]3 years ago

5 0

Explanation:

Law of conservation of energy states that the energy of a system is always constant. 

In other words, we can say that energy can neither be created nor destroyed.

Mechanical energy (E) is the sum of the potential energy (U) and the kinetic energy (K) of the freely falling body. Therefore, E=K+U=constant.

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A cube has a density of 1800 kg/m3 while at rest in the laboratory. What is the cube's density as measured by an experimenter in

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Answer:

4341.44763 kg/m³

Explanation:

$\rho'$ = Actual density of cube = 1800 kg/m³

$\rho$ = Density change due to motion

v = Velocity of cube = 0.91c

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Relativistic density is given by

$\rho=\frac{\rho'}{\sqrt{1-\frac{v^2}{c^2}}}\\\Rightarrow \rho=\frac{1800}{\sqrt{1-\frac{0.91^2c^2}{c^2}}}\\\Rightarrow \rho=\frac{1800}{\sqrt{1-0.91^2}}\\\Rightarrow \rho=4341.44763\ kg/m^3$

The cube's density as measured by an experimenter in the laboratory is 4341.44763 kg/m³

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Prove and state law of conservation of energy​

Prove and state law of conservation of energy