Found this:
Any object moving in a circle or along a curve is changing velocity (accelerating) even if its speed is constant, because its direction is changing. ... An object moving in a circular path at constant speed is a simple example of acceleration at constant speed because its velocity is changing direction.
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
Hey there
the answer is
B.
He should look for areas in his life that he is dissatisfied with and speak to a counselor.
thank you
SAVAGELEGEND72
Answer:
Option D. 274.75 units²
Explanation:
From the question given above, the following data were obtained:
Radius (r) = 3.5 units
Height (h) = 9 units
Surface Area (SA) =?
The surface area of the cylinder can be obtained as follow:
SA = 2πr (h + r)
NOTE: Pi(π) = 3.14
SA = 2 × 3.14 × 3.5 × (9 + 3.5)
SA = 21.98 × 12.5
SA = 274.75 units²
Thus, the surface area of the cylinder is 274.75 units²
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If you have any questions feel free to ask:)
