Today I Learn

2021-04-20 06:33:19 What keeps space empty?

Space is not empty. A point in outer space is filled with gas, dust, a wind of charged particles from the stars, light from stars, cosmic rays, radiation left over from the Big Bang, gravity, electric and magnetic fields, and neutrinos from nuclear reactions.

As the book "Nothingness: The Science of Empty Space" by Dr. Henning Genz describes, space is also filled with two things we can't directly detect: dark matter and dark energy.

Even if all these things could be removed and blocked out from a certain region of space, there would still be three things we could never remove according to Dr. Genz:
(1) vacuum energy,
(2) the Higgs field
(3) spacetime curvature.

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2021-04-20 06:27:10 ​​How does Drum Brake work?

Two-wheelers such as Scooters, commuter Bikes, three-wheelers including auto-rickshaws widely use the Drum Brake system for braking. This type of brake system is used on the rear wheels of most hatchback cars, entry-level sedans & MUVs. It is also widely used on both front & rear wheels of trucks, buses, and other commercial vehicles in combination with hydraulic/pneumatic (either air-pressure or vacuum) brake actuating systems. This system is also known as the ‘Internal Expanding Shoe Type’ brake system. This type of brake got its name from the drum structure of cylindrical-shape. Inside this drum,  the parts of the conventional drum-brake system are housed. Hence, the name.

In the mechanical system such as in two-wheeler & an auto-rickshaw, the brake shoes are actuated by a cam, which is attached to the brake linkage & pedal. When you press the brake pedal, the cam turns. Thus, it causes the brake shoes to expand outwards and rub against the drum. The friction between the brake linings and the drum causes the drum to stop rotating; thereby stopping the wheel. When you release the brake pedal, the retracting springs bring the brake shoes back to their original position. This results in a gap between them and the drum and to again spin it freely. Open / Comment

2021-04-20 06:26:52 Open / Comment

2021-04-17 20:15:22 ​​​​Why do Oil (fuel) Tankers have more than one Compartment instead of carrying all the quantity in a single one?

This is in order to create a baffle system. When transporting liquids, under acceleration and braking, inertia makes all of the fluid weight to act on one side of the container. Similarly, while cornering, the forces act sideways. Since such a characteristic poses as a safety risk as well as leads to quicker wear and tear of vehicle components such as the brakes, baffle system is used to break down the magnitude of forces.

Other than that, different compartments help to deliver to a wider variety of consumers. For example A may require lesser quantity of product than the full capacity of the container, and similarly with B and C and so on. Thus the container can carry the optimum load and deliver the same to A, B etc. as per their individual requirements. Open / Comment

2021-04-17 20:15:19 Open / Comment

2021-04-16 08:51:43 Can a star turn into a planet?

Yes, a star can turn into a planet, but this transformation only happens for a very particular type of star known as a brown dwarf.

Some scientists do not consider brown dwarfs to be true stars because they do not have enough mass to ignite the nuclear fusion of ordinary hydrogen.

At the same time, some scientists do not consider brown dwarfs to be true planets either because they typically sit at the center of a solar system, just like a star.

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2021-04-15 14:40:15 ​​What is an Organoid and for what purpose they are used ?

An organoid is a miniaturized and simplified version of an organ produced in vitro in three dimensions that shows realistic micro-anatomy.

Organoids are an excellent tool to study basic biological processes.

Organoids enable to study how cells interact together in an organ, their interaction with their environment, how diseases affect them and the effect of drugs.

In vitro culture makes this system easy to manipulate and facilitates their monitoring.

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2021-04-14 10:03:45 Wet Market

A wet market is a marketplace selling fresh meat, fish, produce, and other perishable goods as distinguished from "dry markets" that sell durable goods such as fabric and electronics.

Not all wet markets sell live animals, but the term wet market is sometimes used to signify a live animal market in which vendors slaughter animals upon customer purchase.

Wet markets are common in many parts of the world, notably in China, Southeast Asia, and South Asia.

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2021-04-13 17:34:29 Watch live IPL 2021 now Free..

https://hindime.net/ipl/ Open / Comment

2021-04-12 06:54:03 How can bats fly in the dark avoiding obstacles?

The ultrasonic waves produced by bats during flying are reflected back when they hit the obstacles. Hence, bats can find their path without any difficulty. Open / Comment