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3 years ago

Why are “input” and “output” good words to use when discussing systems?

Physics

2 answers:

Ahat [919]3 years ago

4 0

Answer:

Because it gives a direct relation that can be used to obtain the efficiency E = Input/output which tell us how the system works, for example, if the efficiency is bigger than one, this means that the system amplifies the input (the output is bigger than the input) while if the efficiency is less than one, the output is smaller than the input.

Where these quantities can be forces, heat, electricity, or anything.

charle [14.2K]3 years ago

3 0

Answer:

To determine how efficient that system is.

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The concrete slab of a basement is 11 m long, 8 m wide, and 0.20 m thick. During the winter, temperatures are nominally 17°C and

mina [271]

Answer:

$\frac{dQ}{dt}= 4312 W$

Explanation:

As we know that base of the slab is given as

$A = 11 \times 8$

$A = 88 m^2$

now we know that rate of heat transfer is given as

$\frac{dQ}{dt} = \frac{kA}{x} (T_2 - T_1)$

here we know that

$k = 1.4 W/m k$

Also we have

$x =0.20$

$\frac{dQ}{dt} = \frac{1.4(88)}{0.20}(17 - 10)$

$\frac{dQ}{dt}= 4312 W$

7 0

3 years ago

If the water in a lake is everywhere at rest, what is the pressure as a function of distance from the surface? The air above the

Rudiy27

Answer:

101325 + 10055.25h

h = 10.1 m

Explanation:

the pressure at sea level = 1 atm = 101325 Pa

density of sea water = 1025 kg/ m^(3)

pressure due to fluid height = pgh

Absolute pressure = 101325 + 1025*9.81*h

= 101325 + 10055.25h

where h= 0 at sea level at increases downwards

101325 = 1025* 9.81* h

h = 10.1 m

Explanation:

7 0

3 years ago

When is the net force on the car closest to 0?

skelet666 [1.2K]

Answer: The net force is the vector sum of all the forces acting on an object. When an object is in equilibrium (either at rest or moving with constant velocity), the net force acting on it zero. A vector can only have zero magnitude if all of its components are zero. there is more than one force acting on an object, then F is the net force. If two people pull on an object with equal forces in opposite directions, then the net force is zero and the acceleration is zero

Explanation:

8 0

3 years ago

An object begins with a speed of 20 meters per second and slows down to a speed of 10 meters per second over a time of 5 seconds

Andreyy89

Answer:

V = 6 m/s

Explanation:

Given that,

Initial speed of an object is 20 m/s

Final speed of an object is 10 m/s

Time, t = 5 s

We need to find the average speed of the object during these 5 seconds. Let it is equal to V. Here, time is same. The average speed is given by :

$V=\dfrac{x+y}{2}\\\\\text{Putting values}\\\\V=\dfrac{20+10}{5}\\\\V=6\ m/s$

So, the average speed of the object is 6 m/s.

3 0

3 years ago

Newton's laws of motion work well for ordinary situations on earth. However, these laws of motion do not work for all cases. Und

soldier1979 [14.2K]

I believe the answer is C: For objects at extremely fast speeds.
Hope this helps!

5 0

3 years ago

Read 2 more answers