Which type of heating system is often used to heat many buildings from a central location

Answers

Answer 1

Answer: Central heating is often used in cold climates to heat private houses and public buildings. Such a system contains boiler, furnace, heat pump to heat water, steam or air, all in a central location such as furnace room in a home or a mechanical room in a large building. The use of water as the heat transfer medium is known as hydronics.

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C=ne
0.045=n *1.6*10^-19

Answers

math, solve fo n

0.045=n*1.6*10^-19
divide both sides by 1.6
0.028125=n*10^-19
divide both sides by 10^-19
0.028125*10^19=n
2.8125*10^17=n

The statement "force equals mass times acceleration (F = ma)" is Newton's second law of motion. Why is this a law rather than a theory?Options:
a) It has been extensively tested and confirmed through experimentation.
b) It is a hypothesis that is yet to be proven.
c) It is a general explanation for a wide range of phenomena.
d) It is based on mathematical equations but lacks empirical evidence.

Answers

Answer:

a) A statement must be tested without contradiction to be a law.

What is the net force and acceleration of a ball of mass 0.750 kilograms that is subjected to forces of 11.00 newtons and 7.00 newtons from opposite directions?

Answers

m = 0.75kg
F1 = 11N
F2 = 7N

Because forces are in opposite direction, the ball will accelerate in direction of force that has bigger amplitude.

F = m*a
a = F/m
a = (F1-F2)/m
a = 5.333 m/s^2

Answer:

Explanation:

A blender uses 1,500 joules of energy in 5 seconds. What is the power rating of the blender?

Answers

the answer is 300 watts

Answer:

The power rating of the blender is 300 W.

Explanation:

To find the power of an object, you need to divided the work by the time. Thus, we would divide the work, 1,500, by the time, 5 seconds. This gives you the answer, 300 W.

Driving home from school one day, you spot a ball rolling out into the street (Figure 5-21). You brake for 1.20 s, slowing your 950-kg car from 16.0 m/s to 9.50 m/s.a) What was the average force exerted on your car during braking?
b) How far did you travel while braking?

Answers

a ) v = v o + a t ( the acceleration will be negative )
9.50 = 16.0 + a * 1.2
a * 1.2 = -16.0 + 9.50
a * 1.2 = - 6.5
a = - 6.5 : 1.2
a = - 5.4167 m/s²
F = m * a = 950 kg * 5.4167 m/s²
F = 5,145.8 N ( the average force exerted on a car during braking )
b ) d = v o - a t² / 2
d = 16.0 * 1.2 - ( 5.4167 * 1.2² / 2 ) =
= 19.20 - 3.90 = 15.30 m

If chris throws a baseball 60 meters in 4 seconds, what is the average speed of the football?

Answers

The average speed of the football is 15 meters per second. Just divide both of the numbers by 4 :)

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Brody and Ethel are arguing about waves. Brody says that waving his hand back and forth is a scientific wave. Ethel says that it is not. Which statement best describes who is correct?-Brody is correct because the wave involves an input of energy. -Ethel is correct because energy is not carried from one place to another. -Brody is correct because the pattern repeats. -Ethel is correct because the motion has no pattern. Also... Khalad is measuring the amplitude of a wave. What can be known about this wave? -It is a sound wave. -It is a transverse wave. -It is an electromagnetic wave. -It is a mechanical wave.

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