Hydrogen fuel cells is the answer
Answer:
C. ![\frac{3F}{8}](https://tex.z-dn.net/?f=%5Cfrac%7B3F%7D%7B8%7D)
Explanation:
Let initial charges on both spheres be,![q](https://tex.z-dn.net/?f=q)
![F=\frac{Kq^2}{d^2} \ \ \ \ \ \ \ \ \ \ \_i](https://tex.z-dn.net/?f=F%3D%5Cfrac%7BKq%5E2%7D%7Bd%5E2%7D%20%20%20%5C%20%5C%20%5C%20%20%5C%20%5C%20%5C%20%20%5C%20%5C%20%5C%20%20%5C%20%5C_i)
When the sphere C is touched by A, the final charges on both will be,![\frac{q}{2}](https://tex.z-dn.net/?f=%5Cfrac%7Bq%7D%7B2%7D)
#Now, when C is touched by B, the final charges on both of them will be:
![q_c=q_d=\frac{q/2+q}{2}\\\\=\frac{3q}{4}\\](https://tex.z-dn.net/?f=q_c%3Dq_d%3D%5Cfrac%7Bq%2F2%2Bq%7D%7B2%7D%5C%5C%5C%5C%3D%5Cfrac%7B3q%7D%7B4%7D%5C%5C)
Now the force between A and B is calculated as:
![F\prime=\frac{k\times\frac{q}{2}\times \frac{3q}{4}}{d^2}\\F\prime=\frac{3F}{8}](https://tex.z-dn.net/?f=F%5Cprime%3D%5Cfrac%7Bk%5Ctimes%5Cfrac%7Bq%7D%7B2%7D%5Ctimes%20%5Cfrac%7B3q%7D%7B4%7D%7D%7Bd%5E2%7D%5C%5CF%5Cprime%3D%5Cfrac%7B3F%7D%7B8%7D)
Hence the electrostatic force becomes 3F/8
Answer:
Tangential acceleration is in the direction of velocity - along the circumference of a circle if the object is undergoing circular motion
a = (V2 - V1) / T
Radial acceleration is perpendicular to the direction of motion if the object is not moving in a straight line (perhaps along the circumference of a circle)
a = m V^2 / R = m ω^2 R where R is the radius vector of the velocity - note that the Radius vector is directed from the center of motion to the object and for circular motion would be constant in magnitude but not in direction
A. 1/9
Explanation:
The gravitational force between two objects is given by
![F=G\frac{m_1 m_2}{r^2}](https://tex.z-dn.net/?f=F%3DG%5Cfrac%7Bm_1%20m_2%7D%7Br%5E2%7D)
where
G is the gravitational constant
m1 and m2 are the two masses
r is the distance between the two masses
From the formula, we see that the magnitude of the force is inversely proportional to the square of the distance: therefore, if the distance is tripled (increased by a factor 3), the magnitude of the force changes by a factor
![\frac{1}{r^2}=\frac{1}{3^2}=\frac{1}{9}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7Br%5E2%7D%3D%5Cfrac%7B1%7D%7B3%5E2%7D%3D%5Cfrac%7B1%7D%7B9%7D)
Answer:
When evaluating synthetic blends, it's helpful to define the terms “synthetic blend” and “semi-synthetic”. Generally speaking, synthetic blends and semi-synthetic refer to the same thing: an oil that uses a combination of conventional and synthetic base oils in its formulation.
Explanation: