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lisabon 2012 [21]

3 years ago

7

Particulate Motion Unit Test Part 2

2 answers:

pishuonlain [190]3 years ago

6 0

Answer:

1. the ignition provides the energy to break the bonds in molecules and start the reaction

2. some of the energy is lost as heat

3. the chemical energy of the reactants is greater than the chemical energy of the products. energy is released to the surroundings.

4. equal to

5. earths magnetic field deflects most of this radiation

6. energy is the same at each step

Explanation:

just took the test; these are all correct!

natta225 [31]3 years ago

5 0

Explanation:

The ignition provides the energy to break the bonds in molecules and start the reaction
The energy multiplies to keep the engine running
The chemical energy of the reactants is greater than the chemical energy of the products. Energy is released to the surroundings.
twice the energy
Earth’s magnetic field deflects most of this radiation.
Electrons in the atoms jump to a higher energy level.
it is because alcohol i.look on photo.
look it up

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A series RL circuit includes a 6.05 V 6.05 V battery, a resistance of R = 0.655 Ω , R=0.655 Ω, and an inductance of L = 2.55 H.

Ivenika [448]

Answer:

The induced emf 1.43 s after the circuit is closed is 4.19 V

Explanation:

The current equation in LR circuit is :

$I=\frac{V}{R} (1-e^{\frac{-Rt}{L} })$ .....(1)

Here I is current, V is source voltage, R is resistance, L is inductance and t is time.

The induced emf is determine by the equation :

$V_{e}=L\frac{dI}{dt}$

Differentiating equation (1) with respect to time and put in above equation.

$V_{e}= L\times\frac{V}{R}\times\frac{R}{L}e^{\frac{-Rt}{L} }$

$V_{e}=Ve^{\frac{-Rt}{L} }$

Substitute 6.05 volts for V, 0.655 Ω for R, 2.55 H for L and 1.43 s for t in the above equation.

$V_{e}=6.05e^{\frac{-0.655\times1.43}{2.55} }$

$V_{e}=4.19\ V$

5 0

3 years ago

To impart the greatest momentum to an object, should

Helen [10]

Use the largest force for as long a time as possible Ft=mV.
Hope this help

5 0

3 years ago

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Komok [63]

Explanation:

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im soo so sorry

3 0

3 years ago

A long copper rod of diameter 2.0 cm is initially at a uniform temperature of 100°C. It is now exposed to an air stream at 20°C

Lisa [10]

Answer:

t = 4.0 min

Explanation:

given data:

diameter of rod = 2 cm

T_1 = 100 degree celcius

Air stream temperature = 20 degree celcius

heat transfer coefficient = 200 W/m2. K

WE KNOW THAT

copper thermal conductivity = k = 401 W/m °C

copper specific heat Cp = 385 J/kg.°C

density of copper = 8933 kg/m3

charateristic length is given as Lc

$Lc = \frac{V}{A_s}$

$Lc = \frac{\frac{\pi D^2}{4} L}{\pi DL}$

$Lc = \frac{D}{4}$

$Lc = \frac{0.02}{6} = 0.005 m$

Biot number is given as $Bi = \frac{hLc}{k}$

$Bi = \frac{200*0.005}{401}$

Bi = 0.0025

As Bi is greater than 0.1 therefore lumped system analysis is applicable

so we have

$\frac{T(t) - T_∞}{Ti - T_∞} = e^{-bt}$ ............1

where b is given as

$b = \frac{ hA}{\rho Cp V}$

$b = \frac{ h}{\rho Cp Lc}$

$b = \frac{200}{8933*385*0.005}$

b = 0.01163 s^{-1}

putting value in equation 1

$\frac{25-20}{100-20} = e^{-0.01163t}$

solving for t we get

t = 4.0 min

6 0

3 years ago

An object is moving in a negative direction with a negative acceleration, for example an object dropped out a window. What does

blsea [12.9K]

Answer:

yes bc they are falling :]

Explanation:

5 0

3 years ago

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