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3 years ago

How is the percent efficiency of a machine determined?

1 answer:

3 0

Since work is the change in kinetic energy, the efficiency of a machine can be stated as the percentage of the output work divided by the input work minus the work lost from to friction and heat. Multiply Eff by 100% to get the efficiency percentage.

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A device that does work with one movement and changes the size or direction of a force is a(n)

tresset_1 [31]

A device that does work with one movement and changes the size or direction of a force is a simple machine.

7 0

4 years ago

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if Xc = 7,500 and the resistance is 10,000 in a series RC circuit , what is the impedance of the circuit?

mr_godi [17]

Answer:

The impedance of the circuit = 12500 Ω

Explanation:

Impedance: This is the overall opposition to the flow of current in an a.c circuit by any two or all of the three circuit elements.(R, L, C) is called impedance.

The S.I unit of Impedance is Ohms. (Ω), It can be represented mathematically as

Z = √(Xc² + R²).................... Equation 1

Where Z = impedance, Xc = reactance of the capacitor, R = resistance of the resistor.

Given: Xc = 7500 Ω, R = 10000 Ω

Substituting these values into equation 1,

Z = √(7500² + 10000²)

Z = √(56250000 + 100000000)

Z = √(156250000)

Z =12500 Ω

Therefore, The impedance of the circuit = 12500 Ω

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3 years ago

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What is meant by sundial???

Fofino [41]

Answer:

Sundial is an instrument showing the time by the shadow of a pointer cast by the sun on to a plate marked with the hours of the day.

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2 years ago

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A person takes a trip, driving with a constant speed of 89.5km/h, except for a 22.0−min rest stop. If the person's average speed

Elanso [62]

Answer:

stop using brainly and learn this bs in class

Explanation:

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4 years ago

Mendeleev noticed that if he organized the elements by atomic weight certain patterns emerged. For instance, elements in the sam

Inga [223]

I've had a similar question on an assignment myself, so I'm going to assume it had the same idea.

When you organize them in such a way, the pattern that emerges tells you elements organized by atomic weight have the same number of valence electrons.

Hope this helps!

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3 years ago

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