Hydrogen, helium, and carbon.
<span><span><span>FIRST EQUATION OF MOTION
Vf = Vi + at</span> </span><span>Consider a body initial moving with velocity "Vi". After a certain interval of time "t", its velocity becomes "Vf". Now</span>Change in velocity = Vf - Vi <span>
OR
DV =Vf – Vi</span><span>Due to change in velocity, an acceleration "A" is produced in the body. Acceleration is given by</span>a = DV/t Putting the value of "DV"<span><span>a = (Vf – Vi)/t
at = Vf – Vi
at + Vi =Vf
</span>OR
</span><span>Vf = Vi + at
</span>
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Explanation:
The matter passes in the directions of the noise and flows from the source to a receiver like sound flows through a substance. As the sound flows through a fluid, the material is disrupted for an amount of time, but after the sound leaves, it restored to its normal location.
Current Density is the amount of current that a conductor can safely carry without undue heating per cross - sectional area.
Current Density = Current carrying capacity/Area
Answer:
This question is incomplete but the completed question is below
As a girl pushes an object across a wood floor, she suddenly comes to an area where the floor has been waxed recently, making it slippery. What becomes true of the coefficient of kinetic friction? A. The coefficient of kinetic friction increases. B. The coefficient of kinetic friction decreases. C. The coefficient of kinetic friction becomes zero. D. The coefficient of kinetic friction becomes negative.
The correct option is B
Explanation:
Coefficient of kinetic friction can be defined as the frictional force resisted by the motion of an object. From the question, it might take the girl to apply a force equivalent to just half that of the weight of the object to overcome friction to keep the object moving on a wood floor. Once she gets to the waxed area, the frictional force reduces, thereby also reducing the coefficient of kinetic friction further. Thus, she will be able to use less than half of the force (equivalent to less than half of the weight of the object) to push the object.
Thus, the correct option is B.
