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mash [69]
3 years ago
7

The process of converting energy produced by wind turbines into electricity is about 40 percent efficient. If the transport of e

lectricity is 90 percent efficient and fluorescent light bulb efficiency is known to be 20 percent, what is the overall efficiency for converting wind into fluorescent lighting
Physics
1 answer:
ExtremeBDS [4]3 years ago
7 0

Answer: 7.2%

Explanation:

Given

Efficiency of converting energy produced by wind into electricity is about \eta_1=40\%

Transport of electricity efficiency \eta_2=90\%

Fluorescent light bulb efficiency is \eta_3=20\%

Overall efficiency is the product of all the efficiencies i.e.

\Rightarrow \eta=\eta_1\times \eta_2\times \eta_3\\\\\Rightarrow \eta=0.4\times 0.9\times 0.2\\\Rightarrow \eta=0.072\ \text{or}\ 7.2\%

Therefore, the overall efficiency is 7.2%

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What makes comets different from asteroids and meteoroids? Question 8 options: A.They don't consist of ice. B.They travel in spa
Rus_ich [418]

Answer:

(C) They consist of ice.

Explanation:

Comet consist of a body of ice, rock and dust that can be several miles in diameter and orbits the sun. Debris from comets is the main source of many meteoroids.

8 0
3 years ago
A 6.3 μC electric charge is placed in an Electric Field with a magnitude of 5.0 x 105 charge due to the Electric Field? N/C. Wha
EastWind [94]

Answer:

F = 3.15 N

Explanation:

Given electric charge, q = 6.3 μC

The magnitude of electric field, E=5\times 10^5\ N/C

We need to find the electric force on the charge due to the electric field. The electric force is given by :

F = qE

Putting all the values,

F=6.3\times 10^{-6}\times 5\times 10^5\\\\F=3.15\ N

So, the required force on the charge is 3.15 N.

7 0
3 years ago
An electrical current flowing through a filament bulb causes it to get hot. Explain why this
sergij07 [2.7K]

Answer:

The reason the filament heats up is because it has a high resistance, which means that as electrons move through the filament, they lose a lot of energy.

First, what is current? Current is comprised of electrons moving through an electric field from a high electric potential to a lower potential. For the current to decrease then, something would need to happen to the electrons that go into the light bulb.  If 1 electron goes into the light bulb, then at the end of everything I need to still have 1 electron someplace. So how do electrons passing through the bulb make light?

Incandescent light bulbs have a small filament which when heated begins to glow and emit light.  The reason the filament heats up is because it has a high resistance, which means that as electrons move through the filament, they lose a lot of energy.  You can think of it as walking on a sidewalk compared to walking in waist deep water.  A wire is like a sidewalk. It has some resistance, but it is so tiny that it can generally be ignored which is why wires are useful in electronic circuits. The high resistance of the light bulb is like trying to walk through waist deep water.  Here energy is being taken from the electrons because of the interactions with the atoms in filament which causes those atoms to heat up, which in turn makes them emit light.

The light bulb is not doing anything to the electrons, so we expect then that any electrons going into the bulb should come out the other side. Since current is just flowing electrons, current stays the same.

Since current is the same on both sides, we know that the electrons are all moving together. Think of it like being in a big loop of people. Since everyone is in a big line you could imagine that you could only move as fast as the slowest person in the line. If everyone is on a big loop of sidewalk then everyone could run around in a circle. This is like having a large current in a loop of wire, or what we call a short. To put the equivalent of a lightbulb into our human circuit, imagine that one section of the sidewalk dips into a pool of water. Now everyone is stuck going as fast as the people trudging through the water. This is why current everywhere in a circuit is smaller when a resistor is introduced. As people trudge through the water they have to work hard to get through the water and they use energy.  In a circuit, this energy comes from the voltage source, like a battery.  The battery loses energy because it has to "pull" the electrons through the high resistance, and this is why the voltage drops across the light bulb

7 0
3 years ago
A baseball has a mass of 145 g. A pitcher throws the baseball so that it accelerates at a rate of 80 m/s2 How much force did the
Katena32 [7]

Answer:

<h2>11.6 N</h2>

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

mass is in kg

1000 g = 1 kg

145 g = 0.145 kg

From the question we have

force = 0.145 × 80

We have the final answer as

<h3>11.6 N</h3>

Hope this helps you

6 0
3 years ago
Two pro baseball players of the same height are testing how far they can throw. One players throws the ball at a 40.0 degrees an
Viktor [21]

Answer:

The  distance traveled by the ball before it lands in the other player's glove is 130.96 m.

Explanation:

Given;

angle of projection of the ball, θ = 40⁰

initial velocity of the ball, u = 36.1 m/s

The distance traveled by the ball before it lands in the other player's glove is the range of the projectile, calculated as follows;

R = \frac{u^2 sin(2\theta)}{g} \\\\R= \frac{36.1^2 \times sin(2\times 40)}{9.8} \\\\R = \frac{36.1^2 \times sin(80)}{9.8} \\\\R = 130.96 \ m

Therefore, the  distance traveled by the ball before it lands in the other player's glove is 130.96 m.

6 0
3 years ago
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