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Scorpion4ik [409]
3 years ago
5

Describe how excavations are done.

Physics
1 answer:
Mazyrski [523]3 years ago
4 0

Answer:

It includes earthwork, trenching, wall shafts, tunneling and underground

Explanation:

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A fixed electric space heater wired by a cable with an ampacity of 30 A should draw a maximum current of A. 30 A. B. 24 A. C. 15
Nookie1986 [14]

Answer: The correct answer is option (A).

Explanation

Ampacity is defined as the maximum amount of the current carried by the conductor continuously without exceeding its temperature rating.

The ampacity of the wire of the heater is 30 A .And this means that wire is capable of conducting current of maximum amount of 30 Ampere through it without exceeding its temperature rating.

Hence, the correct answer is option is (A).

7 0
3 years ago
The rate at which an object’s velocity changes is called its
topjm [15]
I believe it is call “Acceleration”
6 0
3 years ago
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When the plastic coating around a cord is damaged, why does the cord become hazardous?
klemol [59]
Because its expose to the wires inside that could electrify you. 
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3 years ago
A proton is confined within an atomic nucleus of diameter 3.60 fm. part a estimate the smallest range of speeds you might find f
Cerrena [4.2K]
The answer for this problem would be:
Assuming non-relativistic momentum, then you have: 
ΔxΔp = mΔxΔv = h / (4) 
Δv = h / (4πmΔx) 
m ~ 1.67e-27 h ~ 6.62e-34,Δx = 4e-15 --> 
Δv ~ 6.62e-34 / (4π * 1.67e-27 * 4e-15) ~ 7,886,270 m/s ~ 7.89e6 m/s 
That's about 1% of the speed of light, the assumption that it's non-relativistic.
3 0
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When we look up at the stars, we are seeing the future", is this astronomer correct ? Why or why not ?
Andrei [34K]

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if the stars connect to a thing, then it describes.

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