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Bond [772]
3 years ago
8

All energy,potential kinetic within a specific system

Physics
1 answer:
dem82 [27]3 years ago
7 0

Answer:

C

Explanation:

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A high-jump athlete leaves the ground, lifting her center of mass 1.8 m and crossing the bar with a horizontal velocity of 1.4 m
Romashka [77]

Answer:

The minimum speed when she leave the ground is 6.10 m/s.

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Using conservation of energy

K.E+P.E=P.E+K.E

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Put the value into the formula

\dfrac{v_{1}^2}{2}=9.8\times1.8+\dfrac{(1.4)^2}{2}

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v_{1}=\sqrt{2\times18.62}

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An electric heater is rated 1000watts. If a current of 5A pass through the heater, find the value of its resistance.​
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