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Ket [755]
3 years ago
5

Helium does not usually react with other substances. does this mean that helium has no chemical reactions

Physics
1 answer:
IRISSAK [1]3 years ago
4 0
Helium doesn't have chemical reactions it has to be in balloons and it doesn't affect gravity at all so that's why it not have a chemical reactions
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The slope of a velocity versus time graph gives
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An electric charge q of mass m in an oscillating electric field Eosinot experiences force q Eosinot. Suppose it starts from rest
Masja [62]

Answer:

speed of the charge electric is  v = - (Eo q/m) cos t

Explanation:

The electric charge has a very small mass so it follows the oscillations of the electric field. We force ourselves on the load,

          F = q Eo sint

a) To find the velocity of the particle, let's use Newton's second law to find the acceleration and of this by integration the velocity

        F = ma

        q Eo sint = ma

        a = Eo q / m sint

        a = dv / dt

        dv = adt

        ∫ dv = ∫ a dt

        v-vo = I (Eoq / m) sin  t dt

        v- vo = Eo q / m (-cos t)

We evaluate the integral from the initial point, as the particle starts from rest Vo = 0, for t = 0

        v = - (Eo q / m) cos t

b) Kinetic energy

       

         K = ½ m v2

          K = ½ m (Eoq / m)²2 (sint)²

         K = ¹/₂  Eo² q² / m sin² t

c) The average kinetic energy over a period

          K = ½ m v2

         <v2> = (Eoq / m) 2 <cos2 t>

The average of cos2 t = ½, substitute and calculate

          K = ½ m (Eoq / m)²  ½

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1. Describe the motion of the race car shown in the graphic
zmey [24]

The car will slow down due to the negative acceleration (backward)

Explanation:

The figure is missing: find it in attachment.

To answer this question, we have to use Newton's second law, which states that:

F=ma

where

F is the net force on an object

m is its mass

a is its acceleration

We have to apply this law separately on the horizontal direction and vertical direction.

- In the vertical direction, we have two forces acting on the car: 2000 N upward and 2000 N downward, so they cancel out, and the net force in the vertical direction is zero.

- In the horizontal direction, the net force is instead

F=6000 N - 8000 N = -2000 N

In the backward direction (to the right).

So, according to Newton's second law, the car will experience a horizontal acceleration:

a=\frac{F}{m}= -\frac{2000 N}{m}

And the acceleration has the same direction as the net force (so, backward). This means that the acceleration is opposite to the direction of motion of the car, so the car will slow down, since its velocity will decrease.

Learn more about acceleration:

brainly.com/question/9527152

brainly.com/question/11181826

brainly.com/question/2506873

brainly.com/question/2562700

#LearnwithBrainly

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