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KonstantinChe [14]
3 years ago
12

Need help please help

Mathematics
1 answer:
andriy [413]3 years ago
8 0

-1/3

Or, -0.3333333...

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An aluminum rod 0.500 m in length and with a cross-sectional area of 2.20 cm2 is inserted into a thermally insulated vessel cont
netineya [11]

Answer:

a). V_{He}   = 14.6208 litres : b). = 0.29844 Litres/sec

Step-by-step explanation:

a).

Step 1.

Volume when one half of rod is inserted = (50/2)*(2.2) = 55cm³

Step 2.

As we know that,

V_{He} = (ρV_{c}IΔT)_{Al} / (ρL_{v})H_{c}                     where H_{c} = 290 - 4.2 = 285.8K

                                                        sepecififc heat of aluminum = 0.215 cal/g

                                                                                      density = 2.7 g/cm3

      = (2.7)*(55)*(0.215)*(285.8) / (0.125)*(20900)*(1/4186)

V_{He}   = 14.6208 litres

b).

Step 1.

As we know that

  P = kA(dT/dx) = 31*2.2*[(290-4.2)/25]

                         = 779.6624 W

Step 2.

Now, approximate boil rate of helium is:

P/ρL_{v}= [(779.6624)*(10^3g/kg)] / [(0.125)*(20900)]

         = 0.29844 Litres/sec

6 0
3 years ago
438 people signed up for a city soccer league. The league places 15 people on each team. How many teams are there?
valentinak56 [21]
438÷15= 22R8


15×10=150
15×10=150
15×2=30
5 0
3 years ago
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2x+5y when x-3 and y -2
kolezko [41]

Answer:

-16

Step-by-step explanation:

2*-3+5*-2=-16 Hope this helps :D

Please mark brainliest

8 0
3 years ago
Is 2/3 greater then 5/8?
sineoko [7]
The LCD is 24

2 * 8 16
3 * 8 24

5 * 3 15
8 * 3 24


Because 16 over 24 is greater than 15 over 24
2/3 is greater than 5/8
5 0
3 years ago
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How much of a radioactive substance must be presented to decay to 80 grams in 12 years if the half-life of the substance is 7.6
max2010maxim [7]

Answer:

Radioactive in half life is 51gram

Step-by-step explanation:

80grams:12years

X :7.6years

12x÷x=x

7.6×80÷12=51gram

4 0
2 years ago
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