Of course it's possible, because it means that sintheta=-2/5 which satisfies this -1<=sintheta<=1
Answer:
Sir Kay was not easily fooled
Explanation:
This is a figurative expression that means that sir kay was not one who could be fooled so easily. From the sentence before this expression, it is stated that sir kay was equal to the occasion based on the fact that lots of eyes rested on him. The expression suggests that he knows every trick and so he was not the kind of person who could be bought over easily.
By using a woodstove, the kilograms of wood required to
heat a room to 20°C is 3 kg
<h3>Efficiency of a machine</h3>
- Efficiency is the percent of work put into a machine (input work) to that of the work done by the machine (output work).
- Efficiency of a machine is always less than 100% because the output work is always less than the input work because some of the input work is used to overcome friction.
Efficiency = work output/work input * 100%
Efficiency of fireplaces = 15%
Amount of food required to heat a room to 20°C = 15 kg
Assuming efficiency of 100%, amount of wood required will be X kg:
X = 15% * 15 kg
X = 2.25 Kg
By switching to woodstoves which are 75% efficient, amount of wood required will be Y kg:
Y = 2.25 kg / 75%
Y = 3 kg
Therefore, by using a woodstove, the kilograms of wood required to
heat a room to 20°C is 3 kg
Learn more about efficiency of machines at: brainly.com/question/3617034
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