If a subway train is moving to the left and then comes to a stop, what direction is the acceleration

1 answer:

8 0

The subway train is moving to the left and then comes to a stop, what direction is the acceleration will be towards right and will be positive.

The train comes to a stop, this means that the velocity gradually decreases. Hence, the acceleration must be positive and points towards the right.

velocity and acceleration:

velocity is the charge of alternate inside the position of an object, at the same time as acceleration is the rate of trade of the fee. consider the movement alongside a line. If the velocity and acceleration are in the same route, then the charge constantly will growth in time. inside the meantime, if the speed and acceleration are in contrary instructions, then the rate steadily decreases to 0 speed, reverses route, and now the velocity is in the identical path of the acceleration.

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A vertical straight wire carrying an upward 26-A current exerts an attractive force per unit length of 7.3×10−4 N/m on a second

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The direction of current in the second wire will be upward.

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We first need to find the direction of the magnetic field due to the first wire using the right-hand thumb rule.

Knowing that, one can easily find the direction of the second wire by using the right-hand rule.

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Therefore,

$I_2=\frac{F}{\Delta L} \frac{2\pi r}{\mu_oI_1} =\frac{7.3\times10^{-4}\times 2\pi\times0.075}{1.256\times10^{-6}\times26} A=1.053A$

<em>Image attached for better understanding of the problem.</em>

<em>(Source: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/wirfor.html)</em>

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<h3>What is surface temperature?</h3>

Generally, The temperature at a surface is referred to as the surface temperature. In particular, it may refer to the surface air temperature, which is the temperature of the air that is relatively close to the earth's surface.

In conclusion, The star in question is of the K5V type. Therefore, the temperature of the surface of this must be somewhere between 5200 and 3700 kelvin. The star with the designation HIP 87937, often known as Bernard's star, is of the G2V type. Stars of this type have a surface temperature that falls anywhere between 6200 and 5200 degrees Celsius. Therefore, it should come as no surprise that the surface temperature of the given star is lower than that of HIP 87937.