The answer is easy if you know the physics.
<span>a/a' = (r/R)^2 = (r/9r)^2 = 1/81; so that a = a'/81.
A's radial acceleration must be 1/81 of B's. And each acceleration is a = v^2/R and a' = V^2/r, where v and V are the tangential speeds you want the ratio for. </span>
<span>a = v^2/R = v^2/9r = V^2/81r = a'/81 In which case v^2/V^2 = 9/81 = 1/9; so that 1/3 = Va/Vb ANS</span>
Answer:
Electric current is flow of electrons in a circuit.
Explanation:
Wires are made up of conductors such as copper or aluminum. Atoms of metal are made up of free electrons, which freely move from one atom to the next. If an electron is added in wire, a free electron is attracted to a proton to be neutral. Forcing electrons out of their orbits can cause a lack of electrons. Electrons, which continuously move in wire, are called Electric Current.
Answer:
v > ii > iii > i > iv
Explanation:
The speed of light does not depend on the wavelength of light rather the medium through which it passes through.
v) The speed of light in a vacuum is maximum = 300000 km/s
ii) The speed of light in air = 2999910.026 km/s
iii) The speed of light in water = 2255639.097 km/s
i) The speed of light in glass = 1973684.210 km/s
iv) The speed of light in diamonds = 1239669.421 km/s
Hence the ranking will be
v > ii > iii > i > iv
Pressure and volume of a gas are inversely related. As one goes up, the other goes down, and vice-versa.
Answer:A
Explanation:
The image is formed behind the mirror.
