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melomori [17]
3 years ago
8

A robin in flight has 20.8 J of PE when it is 27.6 m high. What is the mass of the robin? (Unit = kg)

Physics
2 answers:
schepotkina [342]3 years ago
7 0

Answer:

<h2>\boxed{  \bold{ \purple{0.0769 \: kg \: }}}</h2>

Explanation:

\sf{Potential   Energy ( P.E ) \:  =  \: 20.8 \: joule}

\sf{distance \:  = 27.6 \: metre}

\sf{mass = } ?

\sf{acceleration \: due \: to \: gravity = 9.68 \:  {metre \: per \: second}^{2} }

Now, let's find the mass:

\sf{PE  \:  =  mass \times gravity \:  \times  \: distance}

plug the values

⇒\sf{20.8 = m \times 9.8 \times 27.6}

Multiply the numbers

⇒\sf{20.8 = 270.48 \: m}

Swap the sides of the equation

⇒\sf{270.48m = 20.8}

Divide both sides of the equation by 270.48

⇒\sf{ \frac{270.48m}{270.48}  =  \frac{20.8}{270.48} }

Calculate

⇒\sf{0.0769} kg

Hope I helped!

Best regards!!

lora16 [44]3 years ago
6 0

Answer:

\huge \boxed{\mathrm{0.0769 \ kg}}

Explanation:

\displaystyle \sf Mass=\frac{Potential \ energy}{Acceleration \ of \ gravity \times Height}

\displaystyle m=\frac{PE}{gh}

\mathrm{We \ need \ to \ find \ the \ mass.}

\displaystyle m=\frac{20.8}{9.8 \times 27.6}

m= 0.0769

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