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babymother [125]
3 years ago
10

PLS PLS PLS PLS PLS PLS PLS PLS PLS PLS PLS HELP

Physics
2 answers:
PIT_PIT [208]3 years ago
7 0

Answer:

So, instead of fossil fuels, the magnetic field thats creatd by electrified coils in the guideway walls, and on the track combine to propel the train. Just think of it as playing with magnets. The opposite attract while if you put norh to north or south to south, they will push away from each ther. This is just the basic principle of electromagnetic propulsion

Explanation:

rodikova [14]3 years ago
7 0

Answer:

C motors

Electric motors use the forces produced by magnetic fields to produce a turning motion. If you put a length of wire in a magnetic field and pass a DC current through it (such as from a battery), the wire will move. This is called the motor effect.

To make a simple DC motor, you need:

two bar magnets

a coil of wire wrapped around something to support it

an axle for the coil of wire to spin around

two half rings (‘split rings’)

hope this helps

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Responsibilities of a class are derived from ________________.
mihalych1998 [28]

Answer:

The correct option is a behavioural models of the the to-be system.

Explanation:

As the  Use case analysis method generates the analysis classes list  such that the classes are capable of performing the behavior needed to make the system function successfully. From these analysis classes list the responsibilities of each class are defined.

As the list is derived from the behavioural models of the system, thus option a is the correct option.

7 0
3 years ago
The only force acting on a 2.9 kg canister that is moving in an xy plane has a magnitude of 7.5 N. The canister initially has a
Elodia [21]

Answer:15.66 J

Explanation:

mass of block \left ( m\right )=2.9 kg

Force magnitude=7.5 N

Initial velocity =3.9\hat{i} m/s

Final velocity=5.1 \hat{j} m/s

Initial Kinetic Energy=\frac{1}{2}mv^2

=\frac{1}{2}\times 2.9\times 3.9^2=22.05 J

Final Kinetic Energy=\frac{1}{2}mv^2

=\frac{1}{2}\times 2.9\times 5.1^2=37.714 J

Work Done =Final -Initial Kinetic energy=37.714-22.056=15.66 J

7 0
4 years ago
Convective cooling cools rocks much more rapidly than heat conduction. hydrothermal circulation represents convective cooling at
Luda [366]
When geophysicists measure the geothermal gradient in areas on the ridges where there is no activity hydrothermally, the gradient is far below than what is predicted theoretically, but when measured near hydrothermal vents it is more than what is predicted. This is because most of the heat is being carried through convection by hydrothermal systems so that the average gradient when measured far from the circulation would be depressed or lower.
7 0
3 years ago
At time t=0t=0 a proton is a distance of 0.360 mm from a very large insulating sheet of charge and is moving parallel to the she
insens350 [35]

Answer:

1.34 * 10^{3}m/s

Explanation:

Parameters given:

distance of the proton form the insulating sheet = 0.360mm

speed of the proton, v_{x} = 990m/s

Surface charge density, σ = 2.34 x 10^{-9} C/m^{2}

We need to calculate the speed at time, t = 7.0 * 10^{-8}s.

We know that the proton is moving parallel to the sheet, hence, we can say it is moving in the x direction, with a speed v_{x} on the axis.

The electric force acting on the proton moves in the y direction, so this means it is moving with velocity v_{y} in the y axis.

Hence, the resultant velocity of the proton is given by:

v = \sqrt{v_{x} ^{2} + v_{y} ^{2}}

v_{x} = 990m/s from the question. We need to find v_{y} and then the resultant velocity v.

Electric field is given in terms of surface charge density, σ as:

E = σ/ε0

where ε0 = permittivity of free space

=> E = \frac{2.34 * 10^{-9} } {2 * 8.85418782 * 10^{-12} }

E =  132 N/C

Electric Force, F is given in terms of Electric field:

F = eE

where e = electronic charge

=> F = ma = eE

∴ a = eE/m

where

a = acceleration of the proton

m = mass of proton

a = \frac{1.60 * 10^{-19} * 132}{1.672 * 10^{-27} }

a = 1.3 * 10^{10} m/s^{2}

Therefore, at time, t = 7.0 * 10^{-8}, we can use one of the equations of linear motion to find the velocity in the y axis:

a = \frac{v_{y} - v_{0}}{t} \\\\=> v_{y} = v_{0} + at

v_{y} = 0 + (1.3 * 10^{10} * 7.0 * 10^{-8})

v_{y} = 910 m/s

∴ v = \sqrt{v_{x} ^{2} + v_{y} ^{2}}

v = \sqrt{990^{2} + 910^{2} }

v = \sqrt{1808200}

v = 1344.69 m/s = 1.34 * 10^{3}m/s

8 0
4 years ago
Please help me with my question
Rufina [12.5K]
Number 1!!!!!!!!!!!!!

6 0
3 years ago
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