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pishuonlain [190]
3 years ago
6

Which is a disadvantage of using wind as an energy source? Check all that apply.

Physics
2 answers:
Anvisha [2.4K]3 years ago
8 0

Answer: It may be unreliable.    

Explanation:

Harnessing wind a s a source of energy is very efficient and renewable. It does not produce any waste and is environment friendly energy resource because it is naturally occurring.

But it is unreliable. The wind is the motion of air from high pressure region to low pressure region. Thus, we cannot start or stop wind turbines to spin. It depends on the wind and its speed.

kramer3 years ago
7 0

Answer:

A) it may be unreliable

Explanation:

Sorry years late but maybe for people that need it now

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If a system has 225 kcal of work done to it, and releases 5.00 × 102 kj of heat into its surroundings, what is the change in int
vovikov84 [41]

We can solve the problem by using the first law of thermodynamics:

\Delta U = Q-W

where

\Delta U is the change in internal energy of the system

Q is the heat absorbed by the system

W is the work done by the system on the surrounding


In this problem, the work done by the system is

W=-225 kcal=-941.4 kJ

with a negative sign because the work is done by the surrounding on the system, while the heat absorbed is

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Therefore, by using the initial equation, we find

\Delta U=Q-W=-500 kJ+941.4 kJ=441.4 kJ

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The velocity of the submarine immediately after firing the missile is 0.0104 m/s

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