7. What is the velocity of an object with a distance of 90m south and a time of<br> 5s?

B. a student attaches a nozzle with an exit radius that is n times smaller than the faucet radius. 2b) let n = 3 i. how will thi

JulijaS [17]

Part a)

Flow rate is defined as rate of volume flow

it is determined by

$Q = \frac{dV}{dt}$

now if the radius of pipe is reduced then we assume here that liquid flow is ideal flow here and there is no change in the density of liquid.

So here we know that since mass is always conserved

so

$\frac{dm}{dt}_{in} = \frac{dm}{dt}_{out}$

so we have

$\rho\frac{dV}{dt}_{in} = \rho\frac{dV}{dt}_{out}$

$\frac{dV}{dt}_{in} = \frac{dV}{dt}_{out}$

now we can say from above equation that there is no effect on the flow rate is we change the radius of pipe

Part b)

now in order to find the speed of flow'

$\frac{dV}{dt}_{in} = \frac{dV}{dt}_{out}$

$A_{in}v_{in} = A_{out}v_{out}$

$\pi r^2 v_{in} = \pi (\frac{r}{n})^2 v_{out}$

$v_{in} = \frac{v_{out}}{n^2}$

so final speed will be

$v_{out} = n^2 v_{in}$

here we have n = 3

$v_{out} = 9* v_{in}$

so flow speed will be 9 times more than initial speed

6 0

3 years ago

Which energy changes take place when a pedaling cyclist uses a generator (dynamo) to light his bicycle

Fynjy0 [20]

When the pedaling cyclist uses a generator (dynamo) to light his bicycle lamp, the energy change is from mechanical to electrical.

<h3>Law of conservation of energy</h3>

The law of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another.

Thus, we can conclude the following as it relates to energy changes;

When the pedaling cyclist uses a generator (dynamo) to light his bicycle lamp, the energy change is from mechanical to electrical.

Learn more about conservation of energy here: brainly.com/question/166559

4 0

1 year ago

Read 2 more answers

a sprinter starts from rest and accelerates at a rate of 0.16 ms ^-2 over a distance of 50.0 meters . How fast is the athlete tr

vlada-n [284]

Answer:

Final velocity v = 4 m/s

Explanation:

Given:

Initial velocity u = 0 m/s

Acceleration a = 0.16 m/s²

Distance s = 50 m

Find:

Final velocity v

Computation:

Using; v² = u² + 2as

v² = (0)² + 2(0.16)(50)

v² = 16 m/s

v = 4 m/s

Final velocity v = 4 m/s

7 0

3 years ago

An apple falls because of the gravitational attraction to earth. how does the gravitational attraction of earth to the apple com

Sphinxa [80]

The forces between the apple and Earth are the same in magnitude. Force is the same either way, but the corresponding accelerations of each are different.

8 0

2 years ago

A computer monitor accelerates electrons and directs them to the screen in order to create an image. If the accelerating plates

tensa zangetsu [6.8K]

Answer:

Electric field at a distance of 1.45 cm will be $172.41\times 10^4N/C$

Explanation:

We have given the distance d = 1.45 cm = 0.0145 m

And the potential difference $V=2.5\times 10^4volt$

There is a relation between potential difference and electric field

Electric field at a distance d due to a potential difference is given by

$E=\frac{V}{d}$ , here E is electric field, V is potential difference and d is distance

So $E=\frac{V}{d}=\frac{2.5\times 10^4}{0.0145}=172.41\times 10^4N/C$

8 0

3 years ago

7. What is the velocity of an object with a distance of 90m south and a time of 5s?