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Bess [88]
3 years ago
11

An electric drill transfers 200 J of energy into a useful kinetic energy store. It also transfers 44 J of energy by sound and 48

J of energy by heat. What is the efficiency of this drill? Round your answer to the nearest whole number
Physics
1 answer:
kramer3 years ago
3 0

Answer:

Er = 108 [J]

Explanation:

To solve this problem we must understand that the total energy is 200 [J]. Of this energy 44 [J] are lost in sound and 48 [J] are lost in heat. In such a way that these energy values must be subtracted from the total of the kinetic energy.

200 - 44 - 48 = Er

Where:

Er = remaining energy [J]

Er = 108 [J]

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If you increase the elasticity of a material, what happens to the speed of a mechanical wave going through it?
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Answer:

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Explanation:

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3 years ago
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If the window is 11 m above the ground, find the time the stone is in flight.
rjkz [21]
d=vi*t+(1/2)gt²

d=11 m
g=9.8 m/s²
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11 m=0 m/s*t+(1/2)9.8 m/s²t²
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