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omeli [17]
2 years ago
15

Track lighting is not permitted to be installed less than ____________ above the floor unless it has an open-circuit voltage of

less that 30 volts RMS. Select one:
a. 5 feet (1.5 m)
b. 6 feet (1.8 m)
c. 6 feet 7 inches (2.0 m)
d. 7.5 feet (2.3 m)
Physics
1 answer:
Liula [17]2 years ago
4 0
B is the answer hope this helps
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Answer:

Electrical Conductivity is 3200 (\Omega m)^{-1}

Solution:

As per the question:

N_{A} = 10^{24}\ m^{- 3}\ Ga\ atoms

Mobility of electrons, \mu_{e} = 0.26\ m^{2}/ Vs

Mobility of holes, \mu_{h} = 0.020\ m^{2}/ Vs

Charge, Q = 1.6\times 10^{- 19}\ C

Now,

The formula for the conductivity is given by:

\sigma = N_{A}Q\mu_{h}

\sigma = 10^{24}\times 1.6\times 10^{- 19}\times 0.020} = 3200(\Omega m)^{-1}

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3 years ago
True or False <br><br> All objects emit electromagnetic waves.
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Answer:

true

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7 0
3 years ago
A ball is thrown upward. At a height of 10 meters above the ground, the ball has a potential energy of 50 Joules (with the poten
Brilliant_brown [7]

Given that,

A ball is thrown upward. At a height of 10 meters above the ground, the ball has a potential energy of 50 Joules. It is moving upward with a kinetic energy of 50 Joules.

We need to find the maximum height h reached by the ball. Let at a height of 10 meters, it has a potential energy of 50 Joules. So,

mgH=50\\\\mg=\dfrac{50}{h}\\\\mg=\dfrac{50}{10}\\\\mg=5\ N ........(1)

Let at a height of h m, it reaches to a maximum height. at this point, it has a total of 100 J of energy. So,

mgh=50+50\\\\mgh=100\\\\h=\dfrac{100}{5}\\\\h=20\ m

So, the correct option is (E) "h = 20 m".

6 0
3 years ago
2. What is the least possible error encountered
AlekseyPX

Answer: b 0.5mm

Explanation:

6 0
3 years ago
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Aleks [24]

Answer: • using beaker tongs to handle the hot beaker.

• checking the beaker for chips prior to heating on the hot plate.

• Turning off the hot plate after use

Explanation:

The options that will ensure laboratory safety during the experiment will be:

• using beaker tongs to handle the hot beaker.

• checking the beaker for chips prior to heating on the hot plate.

• Turning off the hot plate after use.

We should note that the beaker tongs are simply used in the holding of the beakers that have hot liquids in them. Also, it s vital for the hot plate to be turned off after its use so as to prevent accident.

7 0
3 years ago
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