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2 years ago

Calculate the efficiency of a light bulb that gives 40J of light from 200J of electrical energy’s

Physics

1 answer:

nekit [7.7K]2 years ago

7 0

Answer:

This formula is the most common one used. The efficiency is in a %

20%

Explanation:

Efficiency = energy out / energy in * 100 (for a %)

Efficiency = 40 / 200 * 100

Efficiency = 20%

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What is the equivalent resistance of a circuit that contains two 50.00

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Answer:

Explanation:

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That being the case R = R1 + R2

R1 = 50 ohms

R2 = 50 ohms

R = 50 + 50

R = 100 ohms

Answer A

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3 years ago

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What is the change in length of a 1400. m steel, (12x10^-6)/(C0) , pipe for a temperature change of 250.0 degrees Celsius? Remem

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Answer:

$\Delta L = 4.2 m$

Explanation:

As per the formula of thermal expansion we know that

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so here change in the length of the rod is given as

$\Delta L = L - L_o$

$\Delta L = L_o \alpha \Delta T$

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3 years ago

If the dartboard below is used to model an atom, which subatomic particles would be located at Z? *

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3 years ago

A car is strapped to a rocket (combined mass = 661 kg), and its kinetic energy is 66,120 J.

aliina [53]

Answer:

9.43 m/s

Explanation:

First of all, we calculate the final kinetic energy of the car.

According to the work-energy theorem, the work done on the car is equal to its change in kinetic energy:

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where

W = -36.733 J is the work done on the car (negative because the car is slowing down, so the work is done in the direction opposite to the motion of the car)

$K_f$ is the final kinetic energy