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3 years ago

A summary short about fire saftey

Physics

1 answer:

pentagon [3]3 years ago

3 0

Answer:

Fire safety is the set of practices intended to reduce the destruction caused by fire. Fire safety measures include those that are intended to prevent ignition of an uncontrolled fire, and those that are used to limit the development and effects of a fire after it starts.

Explanation:

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A rocket has initail mass M begins to move from space , with an exhaust constant speed . Find the mass of the rocket while has t

irina1246 [14]

Answer:

$m=\frac{m_{0}}{e}$

Explanation:

Equation of the rocket is,

$m\frac{dv}{dt} =F-v'\frac{dm}{dt}$

Here, v' is the relative velocity of rocket.

In space F is zero.

So,

$m\frac{dv}{dt} =-v'\frac{dm}{dt}\\dv=-v'\frac{dm}{m} \\v=-v'ln\frac{m}{m_{0} }$

Now the momentum can be obtained by multiply by m on both sides.

$P=-v'mln\frac{m}{m_{0} }$

Now for maxima, $\frac{dP}{dm}=0$

$-v'ln\frac{m}{m_{0} }-v'm\frac{m_{0}}{m }m_{0=0$

Now,

$ln(\frac{m}{m_{0} } )=-1\\\frac{m}{m_{0} }=\frac{1}{e} \\m=\frac{m_{0}}{e}$

Therefore, the mass of the rocket while having maximum momentum is $\frac{m_{0}}{e}$

3 0

4 years ago

PLEASE HELP THIS IS TIMED I WILL PICK YOU THE BRAINLIEST!!!!!!!!!!!How are secondary colors of light related to the primary colo

Kipish [7]

Explanation:

Because combining primary colors od light like red, blue, and green created secondary colors like yellow, cyan, and magenta

4 0

3 years ago

A 0.676 m long section of cable carrying current to a car starter motor makes an angle of 57.7º with the Earth’s 5.29 x 10^−5T f

Studentka2010 [4]

Answer:

The current in the wire under the influence of the force is 216.033 A

Solution:

According to the question:

Length of the wire, l = 0.676 m

$\theta = 57.7^{\circ}$

Magnetic field of the Earth, $B_{E} = 5.29\times 10^{- 5} T$

Forces experienced by the wire, $F_{m} = 6.53\times 10^{-3} N$

Also, we know that the force in a magnetic field is given by:

$F_{m} = IB_{E}lsin\theta$

$I = \frac{F_{m}}{B_{E}lsin\theta}$

$I = \frac{6.53\times 10^{-3}}{5.29\times 10^{- 5}\times 0.676sin57.7^{\circ}$

I = 216.033 A

5 0

3 years ago

Three resistors are connected in parallel. If placed in a circuit with a 12-volt power supply. Determine the equivalent resistan

Ivan

(a) The equivalent resistance of three parallel resistors is (R₁R₂R₃)/(R₁R₂ + R₁R₃ + R₂R₃).

(b) The total circuit current is 12/R.eq.

<h3>Equivalent resistance of three parallel resistors</h3>

The equivalent resistance of three parallel resistors is calculated as follows;

Let the first resistor = R₁
Let the second resistor = R₂
Let the third resistor = R₃

$\frac{1}{R_{eq}} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_2}\\\\R_{eq} = \frac{R_1R_2R_3}{R_1R_2 + R_2R_3 + R_1R_3}$

<h3>Total Circuit Current </h3>

The total circuit current is calculated as follows;

V = IR

$I= \frac{V}{R_{eq}} = \frac{12 \ V}{R_{eq}}$

<h3>Voltage drop in each resistor</h3>

Voltage drop in resistor 1 = IR₁

Voltage drop in resistor 2 = IR₂

Voltage drop in resistor 3 = IR₃

Learn more about parallel circuit here: brainly.com/question/80537

#SPJ1

3 0

2 years ago

_______ from the mantle rises and flows out through a vent onto Earth's surface as _______. This molten material, sometimes alon

sasho [114]

the answer is magma, lava, volcano

8 0

4 years ago

Read 2 more answers