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Rudiy27
3 years ago
15

Which statement explains why 49 is a perfect square? 49 can be multiplied by 49. 49 is equal to 7 plus 7. 49 is between 36 and 6

4. 49 is equal to 7 times 7.
Engineering
2 answers:
miss Akunina [59]3 years ago
7 0

Answer:

49 is equal to 7 times 7

Explanation:

A "perfect square" is a number that is the product of a whole number that is multiplied by itself.

In the example above, 49 is a perfect square because <em>it is the product of the square of 7</em>. If you multiply 7 by itself, the product is 49.

Other examples of perfect squares are:

25 = <em>25 is equal to 5 x 5</em>

100 = <em>100 is equal to 10 x 10</em>

81 = <em>81 is equal to 9 x 9</em>

16 = <em>16 is equal to 4 x 4</em>

64 = <em>64 is equal to 8 x 8</em>

poizon [28]3 years ago
3 0

Answer:

D

Explanation:

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A product whose total work content time = 50 min is assembled on a manual production line at a rate of 24 units per hour. From p
valentinak56 [21]

Answer:

a)Cycle time = 2.37 min

b)Numbers of workers =21

c)Stations on the line =24

Explanation:

Given that

Total work content time(TWC) = 50 min

Production rate Rp= 24 units/hr

manning level will be close =1.5

Line balancing efficiency =0.94

a)

Cycle time

T_c=\dfrac{60E}{R_P}

T_c=\dfrac{60\times 0.95}{24}

Cycle time = 2.37 min

b)

Numbers of workers ,W

W=\dfrac{TWC}{T_c}

W=\dfrac{50}{2.37}

W= 21

Numbers of workers =21

c)

Stations on the line(n)

Lets find service time Ts

Ts = Cycle time -  Time for repositioning

Ts = Tc- Tr

Ts= 2.37  - 9/ 60 min

Ts= 2.22 min

We  know that efficiency

\eta=\dfrac{TWC}{n.T_s}

0.94=\dfrac{50}{n\times 2.22}

n=23.94  ⇒n=24

n=24

Stations on the line =24

7 0
3 years ago
A(n) _______ is turned by the crankshaft, compresses the air, and forces it into the engine.
zzz [600]

Answer:  

Explanation:

internal combustion engine.

3 0
4 years ago
Historical thinking skills can be divded into there main processes
morpeh [17]

Answer:

asking questions, drawing conclusions, and gathering information.

Explanation:

hope this helps!

7 0
4 years ago
Air enters a 34 kW electrical heater at a rate of 0.8 kg/s with negligible velocity and a temperature of 60 °C. The air is disch
Flura [38]

Answer:

79 kW.

Explanation:

The equation for enthalpy is:

H2 = H1 + Q - L

Enthalpy is defined as:

H = G*(Cv*T + p*v)

This is specific volume.

The gas state equation is:

p*v = R*T (with specific volume)

The specific gas constant for air is:

287 K/(kg*K)

Then:

T1 = 60 + 273 = 333 K

T2 = 200 + 273 = 473 K

p1*v1 = 287 * 333 = 95.6 kJ/kg

p2*v2 = 287 * 473 = 135.7 kJ/kg

The Cv for air is:

Cv = 720 J/(kg*K)

So the enthalpies are:

H1 = 0.8*(0.72 * 333 + 95.6) = 268 kW

H2 = 0.8*(0.72 * 473 + 135.7) = 381 kW

Ang the heat is:

Q = 34 kW

Then:

H2 = H1 + Q - L

381 = 268 + 34 - L

L = 268 + 34 - 381 = -79 kW

This is the work from the point of view of the air, that's why it is negative.

From the point of view of the machine it is positive.

4 0
4 years ago
The temperature in a pressure cooker is 130 degree C while the water is boiling. Determine the pressure inside the cooker.
emmasim [6.3K]

Answer:

The pressure inside the cooker is 1.0804 atm.

Explanation:

Boiling occurs when the vapor pressure becomes equal to atmospheric pressure.

<u>For water, At standard conditions (Pressure = 1 atm) boiling occurs at 373.15 K.</u>

So, Standard conditions:

T₁ = 373.15 K

P₁ = 1 atm

Given ,

The water boils at Temperature =  130 °C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15  

So, the temperature, T₂ = (130 + 273.15) K = 403.15 K

To find pressure inside the cooker (P₂) :

<u>Applying Amontons's Law as:</u>

\frac {P_1}{T_1}=\frac {P_2}{T_2}

So,

P_2=\frac {P_1}{T_1} \times {T_2}

P_2=\frac {1 atm}{373.15 K} \times {403.15 K}

P_2=1.0804 atm

<u>Thus, The pressure inside the cooker is 1.0804 atm.</u>

6 0
3 years ago
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