Room heaters are usually installed at the ground level

SAT

2 answers:

Trava [24]3 years ago

7 0

Answer:

As you know hot air Rises up and cold air settles down so room heater is placed near to the floor so that the heat can move uniformly from down to up.

So by heating the cold air at the bottom it is more efficient and creates an updraft and circulates the air better than if it were heated at the top.

saveliy_v [14]3 years ago

6 0

Answer:

Cold air sinks. So by heating the cold air at the bottom it is more efficient and creates an updraft and circulates the air better than if it were heated at the top.

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Soon Yi loves to bake, and she is making flaky pastry. Soon Yi starts with a layer of dough 222 millimeters (\text{mm})(mm)left

frozen [14]

Answer:

3 times

Explanation:

When the dough is folded, it increases by a constant factor. We can model the growth of the thickness using the exponential growth model

$T(n)=T_0(1+r)^n$

Where:

Initial thickness, $T_0$ = 2mm

Growth factor, r =8%=0.08

We want to find the smallest number of times Soon Yi will have to roll and fold the dough so that the resulting dough is at least 2.5mm.

i.e When $T(n)\geq 2.5$ mm$

$2(1+0.08)^n\geq 2.5\\2(1.08)^n\geq 2.5\\$Divide both sides by 2$\\\dfrac{2(1.08)^n}{2}\geq \dfrac{2.5}{2}\\\\1.08^n\geq 1.25\\\\$Change to logarithm form\\n \geq \log_{1.08}1.25\\\\n\geq \dfrac{\log 1.25}{\log 1.08} \\\\n\geq 2.9$