4 years ago

11. A depression in the ground due to a cave collapse or acidic water dissolution of limestone is called a

Physics

1 answer:

Ierofanga [76]4 years ago

4 0

It is a sinkhole so yeah.. letter A

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Under what conditions does q, the heat evolved or absorbed by the system in a physical or chemical process, equal the change in

Paladinen [302]

Answer: When $w=-P\Delta V$

Explanation:

According to first law of thermodynamics, energy can neither be created nor be destroyed. It can only be transformed from one form to another.

$\Delta H=\Delta E+P\Delta V$

$\Delta E=q+w$

$\Delta H$ = change in enthalpy

P = pressure

$\Delta V$ = change in volume

$\Delta E$ =Change in internal energy

q = heat absorbed or released

w = work done on or by the system

$\Delta H=q+w+P\Delta V$

Thus for $\Delta E=q+w$ , $w=-P\Delta V$

The heat evolved or absorbed by the system in a physical or chemical process, equal the change in enthalpy of the system when $w=-P\Delta V$

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4 years ago

Sort out electric current as fundamental or derived unit.

Gemiola [76]

Answer:

electric current is derived unit.

Explanation:

According to the definition of electric current, it appears to be a derived quantity. Charge on the other hand seems more fundamental than electric current.

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Four squares are in a 2×2 grid.

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3 years ago

Two ropes support a load of 478 kg. The two ropes are perpendicular to each other, and the tension in the first rope is 2.2 time

sveta [45]

Answer:

T₂ = 1937.68 N

Explanation:

First, we will calculate the weight of the object:

$W = mg = (478\ kg)(9.81\ m/s^2)\\W = 4689.18\ N$

Now, we will calculate the resultant tension in the ropes. Since the ropes are perpendicular. Therefore,

$T = \sqrt{T_1^2+T_2^2}\\$

where,

T = Resultant Tension

T₁ = Tension in rope 1

T₂ = Tension in rope 2

According to the given condition tension in the first rope is 2.2 times the tension in the second rope:

T₁ = 2.2 T₂

Therefore

$T = \sqrt{(2.2T_2)^2 + T_2^2}\\\\T = 2.42T_2$

Now, the weight of the object must be equal to the resultant tension for equilibrium:

$T = W\\2.42T_2 = 4689.18\ N\\\\$

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3 years ago