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MArishka [77]
3 years ago
10

Powered and rotating type concrete troweling machines that are manually guided shall be equipped with a control switch that will

automatically shut off power whenever hands of the operator are removed from equipment handles.
True or False?
Physics
1 answer:
xz_007 [3.2K]3 years ago
7 0

Answer:

True

Explanation:

Hand-held concrete troweling machines must be fitted with a control switch that automatically shuts off power when the hands of the user are separated from the handles.

One of the more important of this machine should be closed automatically because the source of energy is limited and doing this wastage of energy can be reduced.Another thing that this is also used from safety purposes.

Therefore the answer is True.

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If a power utility were able to replace an existing 500 kV transmission line with one operating at 1 MV, it would change the amo
mestny [16]

Answer:

It would change the amount of heat produced in the transmission line to four times the previous value.

Explanation:

Given;

initial voltage in the transmission line, V₁ = 500 kV = 500,000 V

Final voltage in the transmission line, V₂ = 1 MV = 1,000,000

The power lost in the transmission line due to heat is given by;

P = \frac{V^2}{R}

Power lost in the first wire;

P_1 = \frac{V_1^2}{R}

R = \frac{V_1^2}{P_1}

Power lost in the second wire

P_2 = \frac{V_2^2}{R}\\\\ R = \frac{V_2^2}{P_2}

Keeping the resistance constant, we will have the following equation;

\frac{V_2^2}{P_2} = \frac{V_1^2}{P_1} \\\\P_2 = \frac{V_2^2P_1}{V_1^2}\\\\

P_2 = \frac{(1,000,000)^2P_1}{(500,000)^2}\\\\P_2 =4P_1

Therefore, it would change the amount of heat produced in the transmission line to four times the previous value.

8 0
3 years ago
PLS PLS PLS PLS PLS PLS PLS PLS PLS PLS PLS HELP
PIT_PIT [208]

Answer:

So, instead of fossil fuels, the magnetic field thats creatd by electrified coils in the guideway walls, and on the track combine to propel the train. Just think of it as playing with magnets. The opposite attract while if you put norh to north or south to south, they will push away from each ther. This is just the basic principle of electromagnetic propulsion

Explanation:

7 0
3 years ago
Read 2 more answers
A balloon contains helium gas. Which applies to the volume of the gas in the balloon when pressure is increased at constant temp
svetlana [45]

Answer:

the volume of the gas decreases

Explanation:

As a balloon rises through the atmosphere, the air pressure around it decreases and the balloon expands.

Good luck!

8 0
3 years ago
A caterpillar travels straight for 3 cm, and then turns left and crawls 4 centimeters farther. If its final position is east of
Romashka-Z-Leto [24]

3-squared + 4-squared = 5-squared

The bug's displacement is 5cm east.


4 0
4 years ago
Read 2 more answers
Two large thin metal plates are parallel and close to each other. On their inner faces, the plates have excess surface charge of
wariber [46]

Answer:

For left = 0  N/C

For right = 0  N/C

At middle = -7.6836 * 10^{-11} \vec{i}  N/C

Explanation:

Given data :-

б =6.8 * 10^{-22} C/ m²

Considering the two thin metal plates to be non conducting sheets of charges.

Electric field is given by

E = \frac{\sigma }{2\varepsilon }

1) To the left of the plate

\vec{E}= (\frac{\sigma }{2\varepsilon })(-\vec{i})+  (\frac{\sigma }{2\varepsilon })(\vec{i})   = 0 N/C.

2) To the right of them.

\vec{E}= (\frac{\sigma }{2\varepsilon })(-\vec{i})+  (\frac{\sigma }{2\varepsilon })(\vec{i})   = 0 N/C.

3) Between them.

\vec{E}= (\frac{\sigma }{2\varepsilon })(-\vec{i})+  (\frac{\sigma }{2\varepsilon })(-\vec{i}) = (\frac{\sigma }{\varepsilon })(-\vec{i}) = -\frac{6.8 * 10^{-22} }{8.85 * 10 ^{-12} }  \vec{i} =   -7.6836 * 10^{-11} \vec{i} N/C

5 0
3 years ago
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