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3 years ago

Explain test that would be made to find and whether such a

Physics

1 answer:

fredd [130]3 years ago

7 0

Answer:

slightly tilt the barometer below barometric height.if the mercury fills up the space,then there Is no air.if it doesnt,then there is air

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A car travels along a straight road to the east for

Korvikt [17]

Answer: 90 m/s, 70 m/s

Explanation:

Given

A car travels 100 m east for 4 seconds and then turn around

goes back west for 50m in 1 sec

Distance traveled in the east is $100\times 4=400\ m$

Distance traveled in the west is $50\times 1=50\ m$

Total distance $=400+50=450\ m$

total displacement $=400-50=350\ m$

total time $t=4+1=5\ s$

Average speed

$\Rightarrow s_{avg}=\dfrac{\text{distance}}{\text{time}}=\dfrac{450}{5}\\\\\Rightarrow s_{avg}=90\ m/s$

Average velocity

$\Rightarrow v_{avg}=\dfrac{\text{displacement}}{\text{time}}=\dfrac{350}{5}\\\\\Rightarrow v_{avg}=70\ m/s$

6 0

3 years ago

A large storage tank, open to the atmosphere at the top and filled with water, develops a small hole in its side at a point 15.6

VladimirAG [237]

To solve this problem it is necessary to take into account the kinematic equations of motion and the change that exists in the volume flow.

By definition the change in speed is given by

$v_f^2-v_i^2 = 2ax$

Where,

x= distance

$v_f =$ final velocity

$v_i =$ initial velocity

a = acceleration

On the other hand we know that the flow of a fluid is given by

$\dot{V} = Av$

Where,

A = Area

v = Velocity

PART A )

Applying this equation to the previously given values we have to

$v_f^2-v_i^2 = 2ax$

$v_f^2-0 = 2*(9.8)(15.6)$

$v_f^2=305.76$

$v_f = 17.48$

Therefore the velocity of the water leaving the hole is 17.48m/s

PART B )

In the case of the hole we take the area of a circle, therefore replacing in the flow equation we have to,

$\dot{V} = \pi r^2 v$

$r = \sqrt{\frac{\dot{V}}{\pi v}}$

$r = \sqrt{\frac{3*10^{-3}*\frac{1}{60}}{\pi (17.48)}$

$r = \sqrt{9.10*10^{-7}}$

$r = 0.54*10^{-4}$

The diameter is 2 times the radius, then is $1.91*10^{-3}$ m or 1.91mm

<em>Note: The rate flow was converted from minutes to seconds.</em>

8 0

3 years ago

which of these changes does a submarine encounter as it returns from the bottom of the ocean to the surface of the ocean? a. the

Lady bird [3.3K]

The amount of sunlight increases

4 0

3 years ago

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Parents have a major role in observing how young children grow at home. Create and discuss simple developmental monitoring tips

Rudik [331]

Answer:

by observation of their children

4 0

3 years ago

Which statement is true about the formation of bounds

MariettaO [177]

The formation of bonds releases energy.

4 0

3 years ago