Answer:
d
Explanation:
According to me answer is d but gas expand more than others
The four inner planets share several features in common.
(Mercury, Venus, Earth and Mars)
They are called terrestrial planets because they have solid, rocky surfaces roughly similar to desert and mountainous areas on the earth.
Answer:
B. twice as much kinetic energy
Explanation:
Lets take the mass of the first marble =2 m
the mass of the second marble = m
We know that velocity of particle does not depends on their mass that is the velocity of both mass will be same after dropping from the roof.
We know that kinetic energy of a mass is given as
![KE=\dfrac{1}{2}Mv^2](https://tex.z-dn.net/?f=KE%3D%5Cdfrac%7B1%7D%7B2%7DMv%5E2)
Kinetic energy for heavier mass
![KE=\dfrac{1}{2}\times 2m\times V^2](https://tex.z-dn.net/?f=KE%3D%5Cdfrac%7B1%7D%7B2%7D%5Ctimes%202m%5Ctimes%20V%5E2)
Kinetic energy for light mass
![KE'=\dfrac{1}{2}\times m\times V^2](https://tex.z-dn.net/?f=KE%27%3D%5Cdfrac%7B1%7D%7B2%7D%5Ctimes%20m%5Ctimes%20V%5E2)
KE=2 KE '
Form above two equation we can say that ,the kinetic energy for the heavier mass is twice the lighter mass.
Therefore the answer will be B.
A large force is required to accelerate the mass of the bicycle and rider. Once the desired constant velocity is reached, a much smaller force is sufficient to overcome the ever-present frictional forces.
Answer:
B.The linear velocity of the gears is the same. The linear velocity is 432π centimeters per minute.
Explanation:
As we know that the small gear completes 24 revolutions in 20 seconds
so the angular speed of the smaller gear is given as
![\omega = 2\pi\frac{24}{20}](https://tex.z-dn.net/?f=%5Comega%20%3D%202%5Cpi%5Cfrac%7B24%7D%7B20%7D)
![\omega = 2.4\pi rad/s](https://tex.z-dn.net/?f=%5Comega%20%3D%202.4%5Cpi%20rad%2Fs)
Now we know that the tangential speed of the chain is given as
![v = r \omega](https://tex.z-dn.net/?f=v%20%3D%20r%20%5Comega)
so we have
![v = (3 cm)(2.4\pi)](https://tex.z-dn.net/?f=v%20%3D%20%283%20cm%29%282.4%5Cpi%29)
![v = 7.2 \pi cm/s](https://tex.z-dn.net/?f=v%20%3D%207.2%20%5Cpi%20cm%2Fs)
![v = 432\pi cm/min](https://tex.z-dn.net/?f=v%20%3D%20432%5Cpi%20cm%2Fmin)
Since both gears are connected by same chain so both have same linear speed and hence correct answer will be
B.The linear velocity of the gears is the same. The linear velocity is 432π centimeters per minute.