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Anon25 [30]
3 years ago
11

Who can help me for this question plz:(

Physics
1 answer:
Vanyuwa [196]3 years ago
8 0
Force = mass x acceleration

15 = mass x 4

Mass = 15/4

Mass = 3.75 Kg
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A 4 kW vacuum cleaner is powered by an electric motor whose efficiency is 90%. (Note that the electric motor delivers 4 W of net
RoseWind [281]

Answer:3.6\ kW

Explanation:

Given

Power Supplied [tex]P_{input}=4\ kW[/tex]

Efficiency of the motor \neta =90\%

and \neta =\dfrac{\text{Power output}}{\text{Power input}}

\Rightarrow 0.9=\dfrac{P_{out}}{4}

\Rightarrow P=0.9\times 4

\Rightarrow P=3.6\ kW

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3 0
3 years ago
A pendulum is raised to a height of 0.3m above its lowest point and released. What is the velocity of the pendulum at its lowest
enyata [817]

Answer:

v = 2,425 m / s

Explanation:

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lowest point

          Em_{f} = K = ½ m v²

         Em₀ = Em_{f}

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let's calculate

        v = √ (2 9.8 0.3)

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3 0
3 years ago
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3 years ago
Energy that is passed on from one trophic level to the next is called what?
yan [13]
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8 0
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M=3kg
p=33kg.m/s
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thus option (c)
6 0
3 years ago
Read 2 more answers
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