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soldier1979 [14.2K]
3 years ago
13

Hello:) anyone able to explain 7(b)? Thank you in advance!:)

Physics
1 answer:
jeyben [28]3 years ago
8 0

What 7(b) means is that a force of 50N is working against the speed of the car since friction helps prevent objects from slipping and it also reduces their speed.

So, all you need to do is subtract 50N from your resultant force on Part A.

You found your resuitant force by doing F=ma.

F = 1000 x 4

F = 4000N

Now, just subtract 50N from it and this will be the resultant force of your car on a rough road with a friction of 50N.

F = 4000N - 50N

F = 3950N

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sesenic [268]

Answer:

Since 1997: A second is a time equal to 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom.

This definition refers to a caesium atom at rest at a temperature of 0 K

Explanation:

5 0
3 years ago
An electron having 500ev energy enters at right angle to a uniform magnetic field of 10^-4 Tesla. If its specific charge is 1.75
gtnhenbr [62]

Answer:

The correct answer might be r = 2.8^{27} meters.

Explanation:

<u>The Answer Given might not be correct, I just did what my brain said.</u>

As the angle is perpendicular so Θ=90.

Putting this in the equation to calculate the magnetic force as:

F = evBsinΘ

F= evBsin90                   *sin90 = 1 so,

F= evB.

Now when the electron will start to move in  a circle, The necessary force that makes the electron rotate in a circle is given by Centripetal force.

So,

    Magneteic Force = Centripetal Force

    evB = \frac{mv^{2} }{r}

    r = \frac{mv}{Be} ......(1)

Now the problem is, We don't know " v " so we need to calculate velocity first,

Calculation of Velocity:

                                   In order to calculate the velocity of electron, We should know the potiential difference with which the electrons are accelerated which in our case is 500ev. If "V" is the potiential difference, the energy gained by electrons during accelreation will be Ve. This appear as kinectic enrgy of electrons as,

         

                        K.E = Ve

                        \frac{1}{2}mv^{2} = Ve

                        v =  \sqrt{\frac{2ve}{m} }................(2)

Putting value of velocity in equation 2 from 1:

r = \frac{mv}{Be}  \sqrt{\frac{2ve}{m} }

r = \sqrt{\frac{2mev}{Be}}

r = \sqrt{\frac{(2)(9.1^{-31})(500) (1.6^{-19} )  }{ (1.75^{11} ) (10^{-4} ) } }

r = 2.8^{27} meters.

                               

8 0
3 years ago
When a substance absorbs or releases heat, the ______ changes.
Nata [24]
I’m pretty sure it’s kinetic energy
8 0
4 years ago
Read 2 more answers
I NEED HELP URGENTLY! FOR 20 POINTS!
puteri [66]

The law of definite proportion states that any sample of the compound will always have the same percentage of each element by weight or mass.

There are four elements that made up matter: air, water earth, and fire is not the main idea of dalton's atomic theory.

<h3>What is the law of definite proportion?</h3>

The Law of Definite Proportion defines that the elements that composed a chemical compound are generally arranged in a definite mass ratio regardless of preparation.

The composition of compounds will always be the same by mass using the law of definite proportions. Chemical compounds are made of elements that are present at fixed ratios in terms of their mass.

In the nitrogen dioxide molecule (NO₂), Nitrogen and oxygen atoms are always present in a 1:2 ratio.

According to Dalton's atomic theory, all matter consists of atoms. The atoms of the same element have the same mass and the atoms of different have different masses and compounds are made of atoms of more than one element.

Therefore, for question (1) option (C) and for (2) option (C) is correct.

Learn more about the law of definite proportion, here:

brainly.com/question/28458716

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5 0
1 year ago
Why doesn't a radio operating with two batteries function when one of the batteries is reversed? ​
bulgar [2K]

Answer:

If you have two batteries and they have precisely the same voltage then placing one backwards will effectively cancel out the voltages and no current will flow. However, batteries aren't like that. The slightest difference in voltages mean that current will flow.

Explanation:

8 0
3 years ago
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