Among the choices the answer should be letter d which is jupiter (mass = 1.90 x 1027 kg)

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Posted in Physics

When parallel light rays exit a concave lens, the light rays diverge converge come together remain parallel

The correct answer to the question is diverge i.e the parallel rays will be diverged ,

EXPLANATION:

A concave lens is a optically transparent spherically lens whose middle portion is thinner, curved inwards, and bulged towards the edge.

The concave lens is a diverging lens. For an ideal concave lens free from aberration, both paraxial rays and marginal rays are diverged after being refracted by the lens.

Unlike convex lens, the parallel rays won’t converge on the principal axis. The refracted rays will appeared to be coming from a point on the principal axis.

Hence, the correct answer to the question is that the parallel light rays will be diverged when they are allowed to pass through the concave lens.

Posted in Physics

When reading a seismograph, _____ waves come first, then _____ waves, and, finally, _____ waves. S, P, L L, P, S P, S, L L, S, P P, L, S

P, S, L

When reading a seismograph, P waves come first, then S waves, and, finally, L waves.

### Explanation;

• Seismic waves are used to measure the strength of an earthquake using and instrument called  seismograph. The major three seismic waves used are the primary waves (P-waves), secondary waves (S-waves) and the L waves.
• Secondary waves move through earth by causing particles in rocks to move at right angles to the direction of the waves.  Primary waves on the other hand move through the earth by causing particles of rocks to move back and forth in the same direction as the waves.
• The primary waves are the first to reach a seismograph after an earthquake
. These waves move in a push-and-pull motion.

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Posted in Physics

How are the inner and outer planets formed

Astronomers believe that the solar system began forming from the great explosion of the big bang, approximately 3.7 billion years ago. The big bang created a gigantic cloud of dust and gas called the solar nebula. This cloud contained several times the mass of the sun that condensed and collapsed into a dense, flat, spinning disk with an extremely hot center. It is thought that the hot central part of the disk gradually became the sun, while the planets and all other objects in the solar system formed from the remaining material.

Posted in Physics

If a resistor of R ohms is connected across a battery of E colts with internal resistance r ohms, then the power (in watts) in the external resistor is [P = frac{E^2R}{(R+r)^2}] If E and r are fixed but R varies, what is the maximum value of the power?

First, let’s calculate it’s value: P(r) = (E² * r) / (r + r )² = E² / (4r) Now to check whether this is a maximum, we can compare it with other values of the function, in points between R = r and the other zeroes of P'(R), which here is R = -r. If P reaches a maximum in R=r, that would mean that (1) we can evaluate P in any point R>r and its value should be less than P(r), you can do this for, e.g. R=2r, which yields P(2r) = (2E²)/(9r), which is obviously smaller than P(r).
Also it means that (2) we can evaluate P in any point R so that -r < R < r, and this value should be smaller than P(r). For example, if we take R to be 0, P(R)=0, which is also smaller than P(r). Thus we have proven that P reaches a maximum in r, with corresponding value E² /(4r).

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