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3 years ago

Object A is negatively charged. Object A and Object B

Physics

1 answer:

love history [14]3 years ago

6 0

Answer:

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Explanation:

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A horizontal pipe 18.0 cm in diameter has a smooth reduction to a pipe 9.00 cm in diameter. If the pressure of the water in the

Rzqust [24]

Answer:

The rate of flow of water is 71.28 kg/s

Solution:

As per the question:

Diameter, d = 18.0 cm

Diameter, d' = 9.0 cm

Pressure in larger pipe, P = $9.40\times 10^{4}\ Pa$

Pressure in the smaller pipe, P' = $2.80\times 10^{4}\ Pa$

Now,

To calculate the rate of flow of water:

We know that:

Av = A'v'

where

A = Cross sectional area of larger pipe

A' = Cross sectional area of larger pipe

v = velocity of water in larger pipe

v' = velocity of water in larger pipe

Thus

$\pi \frac{d^{2}}{4}v = \pi \frac{d'^{2}}{4}v'$

$18^{2}v = 9^v'$

v' = 4v

Now,

By using Bernoulli's eqn:

$P + \frac{1}{2}\rho v^{2} + \rho gh = P' + \frac{1}{2}\rho v'^{2} + \rho gh'$

where

h = h'

$\rho = 10^{3}\ kg/m^{3}$

$9.40\times 10^{4} + \frac{1}{2}\rho v^{2} = 2.80\times 10^{4} + \frac{1}{2}\rho (4v)^{2}$

$6.6\times 10^{4} = \frac{1}{2}\rho 15v^{2}$

$v = \sqrt{\frac{2\times 6.6\times 10^{4}}{15\times 10^{3}}} = 8.8\ m/s$

Now, the rate of flow is given by:

$\frac{dm}{dt} = \frac{d}{dt}\rho Al = \rho Av$

$\frac{dm}{dt} = 10^{3}\times \pi (\frac{18}{2}\times 10^{- 2})^{2}\times 8.8 = 71.28\ kg/s$

3 0

3 years ago

Read 2 more answers

Mark pushes his broken car 140 m down the block to his friend's house. He has to exert a 160 N horizontal force to push the car

sesenic [268]

The thermal energy used by the tires is 1.14 J.

Here, the thermal energy used will be the work done by Mark.

Given,

Distance = 140 m

Force exerted = 160 N

Thermal energy = ?

We know,

Work = force * displacement

But here the thermal energy of tires is asked.

In this question, the thermal energy used is the energy consumed to do the work.

So, using the formula of work we can find the thermal energy.

W = 160 / 140 = 1.14 J

Therefore the thermal energy used by the tires is 1.14J

To learn more about thermal energy, refer: brainly.com/question/1687193

#SPJ4

3 0

1 year ago

"explain why the orbital radius and the speed of a satellite in circular orbit are not independent"

Oxana [17]

In order to achieve stable circular gravitational and centrifugal force must be in balance.
$\frac{mv^2}{r}=G\frac{mM}{r^2} \\ v^2=G\frac{M}{r}\\ v=\sqrt{G\frac{M}{r}$
This relationship tells closer the closser your orbit is to the surface of the planet the faster you have to go. Which makes sense because the closer you are to the planet the stronger gravitational force gets.

5 0

4 years ago

A 2.9 × 103 kg car accelerates from rest under the action of two forces. One is a forward force of 1148 N provided by traction b

Lana71 [14]

Answer:

The car must travel 51.34 m for its speed to reach 2.7 m/s

Explanation:

Mass of car = 2.9 x 10³ kg

Forward force = 1148 N

Resistive force = 941 N

Total force = 1148 - 941 = 207 N

We know

Force = Mass x Acceleration

207 = 2.9 x 10³ x Acceleration

Acceleration = 0.071 m/s²

Now we have equation of motion, v² = u² + 2as

Initial velocity, u = 0 m/s

Final velocity, v = 2.7 m/s

Acceleration, a = 0.071 m/s²

Substituting

v² = u² + 2as

2.7² = 0² + 2 x 0.071 x s

s = 51.34 m

The car must travel 51.34 m for its speed to reach 2.7 m/s

5 0

4 years ago

How is an equation described if the number of atoms of each element in the products equals the number of atoms of each element i

galina1969 [7]

Answer: balanced

Explanation: i just took the test! :) hope this helps

5 0

3 years ago