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Lilit [14]
3 years ago
9

Based on the law of conservation of energy, how can we reasonably improve a machine’s ability to do work?

Physics
2 answers:
MrMuchimi3 years ago
7 0

D. Redefine the machine’s system boundaries.

The Law of Conservation of Energy states that energy can't be created not destroyed. Energy, however, can be changed from one form to another. The law applies to isolated systems only. By redefining and expanding the system (including all factors affecting it) , the machine's ability to do work should improve.

Viefleur [7K]3 years ago
3 0

Friction causes energy loss. By conservation of energy, reducing friction will increase work. So ans is C.

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adell [148]

Answer:

The natural frequency will be 228.11 rad/sec

Explanation:

We have given Inductance L = 0.048 Henry

And the capacitance C = 0.0004 farad

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When only inductor and capacitor is present in the circuit then it is known as LC circuit and  Natural frequency of LC circuit is given by \omega _0=\frac{1}{\sqrt{LC}}=\frac{1}{\sqrt{0.048\times 0.0004}}=228.21\ rad/sec

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Oduvanchick [21]

Lead-207 can change into Lead-208.

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8 0
3 years ago
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viktelen [127]

Answer:

1) 64.2 mi/h

2) 3.31 seconds

3) 47.5 m

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t = Time taken = 2.5 s

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s = Displacement

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1\ m=\frac{1}{1609.344}\ miles

1 hour = 60×60 seconds

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v=u+at\\\Rightarrow a=\frac{v-u}{t}\\\Rightarrow t=\frac{21.7-0}{2.5}\\\Rightarrow a=8.68\ m/s^2

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2)

v=u+at\\\Rightarrow t=\frac{v-u}{a}\\\Rightarrow t=\frac{28.7-0}{8.68}\\\Rightarrow t=3.31\ s

It takes a cheetah 3.31 seconds to reach its top speed.

3)

v^2-u^2=2as\\\Rightarrow s=\frac{v^2-u^2}{2a}\\\Rightarrow s=\frac{28.7^2-0^2}{2\times 8.68}\\\Rightarrow s=47.5\ m

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4) When s = 120 m

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The time it takes the cheetah to reach a rabbit is 120 m is 5.26 seconds

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