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elena-s [515]
3 years ago
10

Considering the two tables below called Orders and OrderLines, how many rows would be returned by this SQL query? SELECT o.Order

ID, ol.OrderLineID FROM Orders AS o LEFT JOIN OrderLines AS ol ON o.OrderID = ol.OrderID ;

Engineering
1 answer:
natima [27]3 years ago
3 0

Answer:

The query will return four (4) rows

Explanation:

(See attachment below for the table)

The query will return rows where ORDERID is the same on both tables i.e. table ORDERS and ORDERLINES.

The similar rows (on column ORDERID) are 1897 and 87; for table ORDERLINESS and table ORDERS.

But on table ORDERLINESS, there are three rows with 1897 (under ORDERID column).

In total, they have 4 rows in common which are

ORDERID

1897

1897

1897 and

87

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In an air standard diesel cycle compression starts at 100kpa and 300k. the compression ratio is 16 to 1. The maximum cycle tempe
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Answer:

\eta=0.60

Explanation:

Given :Take \gamma=1.4 for air

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As we know that  

   T_2=T_1(r^{\gamma-1})

So T_2=300\times 16^{\gamma-1}

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Now find the cut off ration \rho

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\rho=\frac{2031}{909.42}

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So efficiency of diesel engine

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Now by putting the all values

\eta =1-\dfrac{2.23^{1.4}-1}{1.4\times 16^{1.4-1}(2.23-1)}

So \eta=0.60

So the efficiency of diesel engine=0.60

     

7 0
3 years ago
A simple formula to estimate the upward velocity of a rocket (neglecting the aerodynamic drag) is:
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Answer:

Test code:

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aleksandrvk [35]

Answer:

GM

So the bouy does not float with its axis vertical

Explanation:

From the question we are told that:

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Length l=2.5m

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Specific weight of sea water \mu= 10.25kN/m^3

Generally the equation for weight of cylinder is mathematically given by

Weight of cylinder = buoyancy Force

W=(pwg)Vd

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G=\frac{I.B}{2}=2.6m

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GM=BM-BG\\\\GM=0.479m-0.64m\\\\GM=-0.161m\\\\

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GM

So the bouy does not float with its axis vertical

4 0
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