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3 years ago

Why is the light bulb not a closed system?

1 answer:

4 0

Answer:An incandescent light bulb gives only energy of the system in the form of heat. ... The roof of a house is stable but it receives energy from the surroundings and transfers energy through it towards lower temperature side which includes no mass transfer. So, it is best considered as closed system.

Explanation:

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What is the second most widely used illegal drug in the United States

Anni [7]

The answer is marijuana. it may be legal in some places but it is still concerned as an illegal drug

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4 years ago

The drawing shows an equilateral triangle, each side of which has a length of 2.00 cm. Point charges are fixed to each corner, a

Kipish [7]

Answer:

$-2.60097\times 10^{-6}\ C$

Explanation:

k = Coulomb constant = $8.99\times 10^{9}\ Nm^2/C^2$

r = Distance between charges = 2 cm

The electric force is given by

$F=\dfrac{k4\times 10^{-6}q_A}{r^2}$

Also

$F=\dfrac{k4\times 10^{-6}q_B}{r^2}$

The sum of the force is given by

$\sum F=\dfrac{k4\times 10^{-6}q_A}{r^2}cos 30+\dfrac{k4\times 10^{-6}q_B}{r^2}cos 30\\\Rightarrow \sum F=2\dfrac{k4\times 10^{-6}q_A}{r^2}cos 30\\\Rightarrow q_a=\dfrac{\sum Fr^2}{2\times k4\times 10^{-6}cos30}\\\Rightarrow q_a=\dfrac{405\times 0.02^2}{2\times 8.99\times 10^9\times 4\times 10^{-6}cos30}\\\Rightarrow q_a=2.60097\times 10^{-6}\ C$

Thus $q_a=q_b=-2.60097\times 10^{-6}\ C$ .

The negative sign is because the force points downward which is taken as negative

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4 years ago

The resultant velocity with respect to the ground of a fighter

zhuklara [117]

Answer: 145 km/hr

Explanation:

8 0

3 years ago

It was a dark and stormy night.Buffy hameard thunder exactly 6 secounds after she saw lightning , the temperature of air is 15°C

SashulF [63]

Answer:

υ = 345.82 m/s

Explanation:

The formula used to find the speed of sound in air, at different temperatures is given as follows:

$v = v_{0}\sqrt{\frac{T}{273} }$

where,

υ = speed of sound at given temperature = ?

υ₀ = speed of sound at 0°C = 331 m/s

T = temperature in K = 15°C + 273 = 298 k

Therefore, using these values in the equation, we get:

$v = (331 m/s)\sqrt{\frac{298 k}{273 k}}\\$

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3 years ago

how is the work output of a machine calculated a. by measuring the imput force b. by calculating the output distance c. by measu

bearhunter [10]

The work output of a machine is measured or calculated by measuring the output force and the output distance. Work output is the work done by a simple machine or any type of an engine model, it is the energy output, which for machines is always less than the energy input, due to factors such as friction of the moving parts.

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3 years ago

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