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3 years ago

The sound from a bolt of lightning travelled 4.08 km in 12.0 s. What was the speed

Physics

1 answer:

LenaWriter [7]3 years ago

6 0

Answer:

83.67 m/s

Explanation:

Set up a calculation to convert units of measure to what you need.

You have km/s and you need m/s.

4.08km 1000 m 83.67m

----------- X ---------- = --------------- the km will cancel out and you are left

12.0 s 1 km s with m/s

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How to solve <br>9.8 = (x-0) =?<br> 4.3

Nadya [2.5K]

You want to know how to solve it?

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3 years ago

Water is flowing in a fire hose with a velocity of 1.0 m/s and a pressure of 200000 Pa. At the nozzle the pressure decreases to

jeka57 [31]

Answer:

The velocity is $v_n =14.09 \ m/s$

Explanation:

From the question we are told that

The velocity of the water in the pipe is $v_i = 1.0 \ m/s$

The pressure inside the pipe is $P_i = 200000 \ Pa$

The pressure at the nozzle is $P_n = 101300 \ Pa$

The density of water is $\rho = 1000 \ kg / m^3$

For the height $h_1 = h_2 = h$

where $h_1$ is height of water in the pipe

and $h_2$ is height of water at the nozzle

Generally Bernoulli equation is represented as

$\frac{1}{2} \rho * v_i ^2 + \rho * g * h_1 + P_i = \frac{1}{2} \rho v_n ^2 + \rho * g* h_2 + P_n$

=> $\frac{1}{2} \rho * v_i ^2 + \rho * g * h + P_1 = \frac{1}{2} \rho v_n ^2 + \rho * g* h + P_2$

Where $v_n$ is the velocity of the water at the nozzle

Now making $v_n$ the subject

$v_n = \sqrt{\frac{2}{\rho} [ P_i - Pn + \frac{1}{2} \rho v_i^2}$

substituting values

$v_n = \sqrt{\frac{2}{1000} [ 200000 - 101300 + \frac{1}{2} (1000 * (1.0)^2)}$

$v_n =14.09 \ m/s$

6 0

4 years ago

A 200g piece of iron is heated at 100C. It is than dropped into water to bring its temperature down to 22C. What is the amount o

gizmo_the_mogwai [7]

Answer:

6926.4J

Explanation:

Given parameters:

Mass of iron = 200g

Initial temperature = 100°C

Final temperature = 22°C

Unknown:

Amount of heat transferred to the water = ?

Solution:

The quantity of heat transferred to the water is a function of mass and temperature of the iron;

H = m c Ф

m is the mass of the iron

Ф is the change in temperature

C is the specific heat capacity of iron = 0.444 J/g°C

Now;

insert the parameters and solve;

H = 200 x 0.444 x (100-22)

H = 6926.4J

8 0

3 years ago

The force pulling the moon toward Earth depends on the mass of the two bodies and which factor? A. the distance between them B.

dsp73

<span>A. the distance between them

</span>inversely proportional to the square of distance according to
F = Gm1m2/d^2

6 0

3 years ago

Read 2 more answers

Please show the work and steps. The answer is (3.3 s, 15 m/s)

Anna [14]

Answer:

t = 3.3 s and V = 15 m/s

Explanation:

Given that,

Distance covered by the car, d = 50 m

Initial speed, u = 5 m/s

Final speed, v = 25 m/s

Firstly we can find the acceleration of the car using third equation of motion. i.e.

$v^2-u^2=2as\\\\a=\dfrac{v^2-u^2}{2d}\\\\a=\dfrac{(25)^2-(5)^2}{2(50)}\\\\a=6\ m/s^2$

Let t is the time taken by the car to occur this.

$t=\dfrac{v-u}{a}\\\\t=\dfrac{25-5}{6}\\\\t=3.3\ s$

Let v is the average velocity of the car. It can be calculated as follows :

$V=\dfrac{u+v}{2}\\\\V=\dfrac{25+5}{2}\\\\V=\dfrac{30}{2}\\\\V=15\ m/s$

So, the time taken by the car to occur this is 3.3 seconds and the average velocity of the car is 15 m/s.

8 0

3 years ago