How many elements did mendeleev place in group 2

A teacher stands well back from an outside doorway 0.88 m wide, and blows a whistle of frequency 780 Hz. Ignoring reflections, e

AlladinOne [14]

the wavelength is to be 56.67 cm and I know that i should be applying the double slit equation for destructive interference.

5 0

3 years ago

An acrobat performs with a swing, as shown in the diagram . Which of these most likely happens as the acrobat moves from Point 1

UkoKoshka [18]

Acrobat part
A
Plants
b
Rocks
C

6 0

4 years ago

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A fire hose has an inside diameter of 6.40 cm. Suppose such a hose carries a flow of 40.0 L/s starting at a gauge pressure of 1.

inessss [21]

Answer:

The Reynolds numbers for flow in the fire hose.

Explanation:

Given that,

Diameter = 6.40 cm

Rate of flow = 40.0 L/s

Pressure $P=1.62\times10^{6}\ N/m^2$

We need to calculate the Reynolds numbers for flow in the fire hose

Using formula of rate of flow

$Q=Av$

$v=\dfrac{Q}{A}$

Where, Q = rate of flow

A = area of cross section

Put the value into the formula

$v=\dfrac{40.0\times10^{-3}}{3.14\times(3.2\times10^{-2})^2}$

$v=12.44\ m/s$

We need to calculate the Reynolds number

Using formula of the Reynolds number

$n_{R}=\dfrac{2\rho\times v\times r}{\eta}$

Where, $\eta$ =viscosity of fluid

$\rho$ =density of fluid

Put the value into the formula

$n_{R}=\dfrac{2\times100\times12.44\times3.2\times10^{-2}}{1.002\times10^{-3}}$

$n_{R}=7.945\times10^{5}$

Hence, The Reynolds numbers for flow in the fire hose.

3 0

3 years ago

A car accelerates uniformly from rest and reaches a speed of 22.0 m/s in 9.00 s. Assuming the diameter of a tire is 58.0 cm, (a)

Virty [35]

Answer:

Explanation:

Given:

Initial velocity, u = 0 m/s (at rest)

Final velocity, v = 22 m/s

Time, t = 9 s

Diameter, d = 58 cm

Radius, r = 0.29 m

Using equation of motion,

v = u + at

a = (22 - 0)/9

= 2.44 m/s^2

v^2 = u^2 + 2a × S

S = (22^2 - 0^2)/2 × 2.44

= 99.02 m

S = r × theta

Theta = 99.02/0.29

= 341.44 °

1 rev = 360°

341.44°,

= 341.44/360

= 0.948 rev

= 0.95 rev

B.

Final angular speed, wf = v/r

= 22/0.29

= 75.86 rad/s

6 0

3 years ago

Red light Green light is used to work on what skill?

Talja [164]

Running for sure ptttt

4 0

3 years ago

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How many elements did mendeleev place in group 2​

How many elements did mendeleev place in group 2