Can anyone who had given CAT 16 compare the difficulty level of DILR of this mock to that of CAT?
VARC 55 97.32 :*
DILR 52 99.07
QA 59 95.32 Tham jaa kahin to. Range 90 - 99.97 hai iski
Once confined to fantasy and science fiction, time travel is now simply an engineering problem. Physicists schooled in Newton’s laws believed that time moved along a straight, steady course, like a speeding arrow. Then came Einstein in the early 1900s. His equations showed that time is more like a river. The more mass or energy you possess, the more the current around you varies. By moving at high velocity, for instance, you can make time slow down, and when you come to a stop, you’ll be younger than if you’d remained at rest. Thus, a speedy spacecraft makes a fairly basic time machine.
Even after Einstein, most physicists believed the clock ticked in only one direction. Trips to the past were preposterous. But after having examined Einstein’s equations more closely, physicists now realize that the river of time may be diverted into a whirlpool – called a closed timelike curve – or even a fork leading to a parallel universe. In particular, the more mass you can concentrate at a single point, the more you can bend the flow.
In recent years, new designs for time machines have been flying off drawing boards at the world’s top science labs. Exact specifications depend on where in time and space you wish to travel. You’ll need a hefty CPU to solve the relevant equations for your machine’s precise size, shape, motion, location, surroundings, and so on; the more accurately you can nail down these variables, the closer you’ll come to your intended destination.
The design that follows doesn’t have the panache of Doc Brown’s DeLorean in Back to the Future or even H. G. Wells’ brass and quartz dream machine, but it does put time travel within reach of anyone with a couple of fast spaceships, a supercomputer and a solar-system-scale machine shop. Warning: When going back in time, do not – repeat – do not kill your parents before you are born. I take no responsibility for parallel universes in which you find yourself trapped for eternity.
Thorne Plates: When Carl Sagan was writing his 1985 novel Contact, he asked physicist Kip Thorne how to abbreviate the lengthy flight time required for a trip to a distant star. Thorne suggested a wormhole, a shortcut through space-time that almost certainly exists as a consequence of Einsteinian principles, although one has yet to be detected. A few years later, Thorne suggested that a wormhole’s entrances could be positioned in space and time as desired. Unlike some other time machines, this Thorne-inspired design allows round trips. However, it can’t take you back to a time before the machine was built. Here’s how it works:
• Obtain four large conductive plates at least a few miles in diameter. Arrange them in parallel, very close together. The space between each plate will teem with negative energy – a proven phenomenon known as the Casimir effect – creating slices of identical space-time.
• Separate the plates into two pairs. A wormhole will connect the pairs like an umbilical cord.
• Place one pair in a rocket ship and accelerate to almost the speed of light, preferably in a circular path so the rocket doesn’t stray too far. Time will nearly freeze for that set while the other, still on the ground, ages at the usual rate. With each passing moment, the space-borne plates will go farther back in time relative to the others.
• When a sufficient amount of time has passed – preferably decades – step between the earthbound plates. You’ll immediately be transported back in time and across space to the other pair.
Fine print: To activate Thorne plates, the distance between each plate must be less than the width of an atom. The resulting wormhole will be equally small, so getting in and out might be difficult. To widen the portal, some scientists suggest using a laser to inject immense amounts of negative energy. In addition, Thorne believes that radiation effects created by gravitons, or particles of gravity, might fry you as you enter the wormhole. According to string theory, however, this probably won’t happen, so it’s scant reason to cancel your trip.
If you want to travel to the past, you would need to:
[a] Build a ‘Thorne Plates’ type of time machine.
[b] Gather a very large amount of mass in one spot.
[c] Travel in a spacecraft going at nearly the speed of light.
Either [a] or [b]
Either [b] or [c]
Either [a] or [c]
Any one of [a], [b] or [c]
THe solution given says: " Method [c] is incorrect. Travelling at velocities close to that of light will, conceptually, take us into the future and not the past. "
Howver, in the passage, nowhere it can be inferred that travelling at speeds close to light would take one into the future. but in para 1, it is given: "By moving at high velocity, for instance, you can make time slow down, and when you come to a stop, you’ll be younger than if you’d remained at rest. Thus, a speedy spacecraft makes a fairly basic time machine." That implies that travelling at high velocities would take one into the past, contradiction to what is given in the solution!!!!!!!!!!!!!! Can anyone elucidiate?
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how to solve that tennis player set? is there any trick to get all the cases? i took a lot of time whereas when i saw the average no of people who attempted,its quite high.. so how do you people do it?
OA 141 95.91 %ile please tell approximate rank QA17A 17 correct 51 LR 14A12 C 36 VA 23 A 19C 54
VARC - 51- 30A 20C - 94.77 :( :(
DILR - 54 - 22A 19C - 99.42
QA - 86 - 32A 29C - 99.99 :)
OA - 191 - 84A 68C - 99.98