**Answer:**

**maximum flow speed is 5.278 cm/s**

**Explanation:**

given data

temperature = 20°C

diameter d = 3.8 cm

density of water ρ = 1 × 10³ kg/m³

to find out

maximum flow speed

solution

we have given steam line flow so it is laminar flow

and for laminar flow we know reynolds number is Re= 2000

so

Re = ............1

here μ is dynamic viscosity = 0.001003 for 20°C for water

put all value in equation 1

Re =

2000 =

solve it we get v

v = 0.0527 m/s

**so maximum flow speed is 5.278 cm/s**

**Answer:**

**power = 384.92 W**

**Explanation:**

given data

resistance = 44.0 Ω

impedance = 71 Ω

ΔVrms = 210 V

to find out

average power

solution

we know here power formula that is

power = cos∅ .........1

we know here cos∅ =

cos ∅ = = 0.6197

so from equation 1

power = × 0.6197

**power = 384.92 W**

An Exothermic Reaction , gives off more heat, and a little energy to its surroundings.

this can helps us figure out that the answer is , C, More heat is given off into its products.

most people would choose D, but i beg to differ.

**Circle graph i**s the type of graph which most clearly shows the part or percentage related to the whole.

<u>**Explanation:**</u>

**Graphs** are the easiest tool to show the **change **in a given dependent variable with respect to independent variable. The influence or the effects will be seen in the graphs.

There are different kinds of graph like **circle graph, bar graph, line graph.** Each of these have their own method of showing the change in the dependent variable. Among them,** circle graph** is the one which will help to show the percentage of each variable related to the whole.