Dalton was working in his chemistry lab and created a mixture whose weight is contributed by 90% water and 10% Carbon. The weight of the mixture is 20pounds. As he just finished creating the mixture, Dalton needs to go urgently for some urgent work for 2days. When he returned, the weight of water in the mixture was reduced from 90% to 50%.
How much does the mixture weigh now?
Iron = Fe (chemical symbol)
59 = LIX (Roman numerals)
The Famous Coffee Science Riddle
You are served a hot cup of coffee and room-temperature cream at a restaurant. You want to wait a few minutes before you drink the coffee, and you want it to be as hot as possible when you drink it. Should you pour the cream in the coffee:
b) Just before you drink it
c) It doesn’t matter
“Temperature difference” is the driving force for the heat transfer.
Since the coffee is initially very hot and hence it will be cool down at a very fast rate.
If we add cream immediately : The temperature will initially go down for sure but then will cool down at the slower rate as coffees mixed with cream is cooler than coffee alone and therefore heat cool down rate is less. Also, the cream will increase the mass of the content in the cup and hence larger mass will take more time to cool down.
Hence cream should be added immediately
The Classic Barrel Riddle
This is a classic barrel riddle.
You know the barrel is approximately half filled with oil but you are not sure how fill is the barrel is.
How can you check if its
1. Exactly Half filled
2. > Half Filled
3. < Half Filled.
A farmer wanted to sell watermelons in the city. To reach the city, he had to cross a river. So, he embarked on the journey while it was raining. On the way, he felt hungry and thus ate one of the watermelons. Further on a certain distance, he came across a Shark. In order to save himself, he hit the shark with the watermelon.
At this point of time, can you find out if there is any change in the water level?
When he is rowing the boat in the river, the boat is floating with watermelons in it and, therefore, all the watermelons have already displaced the water equal to their volume. Hence, there won’t be any change in the water level, whether the farmer eats it or throws them away.
Spatial Trivia Physics Puzzle
As shown in picture, there are four gears with the following specification
* Gear A has 60 teeth
* Gear B has 40 teeth
* Gear C has 20 teeth
* Gear D has 60 teeth
* Every minute, Gear B makes 15 complete turns.
You have a broom which you balance on your finger keeping your finger exactly on the broom’s center of gravity. You mark that point with the help of a marker. Now you cut the broom from there and are left with two different pieces one of which is longer than the other. The longer piece has the handle part whereas the shorter one comprises of bristles and some party of the handle.
Now, if you weigh the two pieces, which one of them will weigh more?
The torque needed to hold up the longer piece is responsible for the fact that the shorter piece will weigh more. This is the reason why a heavier kid sits closer in on a see-saw against a lighter kid.
Scientific Method Puzzle
You are lying on a beach with a wine bottle enjoying the bright sun. After it goes empty, you friend secures the mouth of the bottle with a cork. You can see a metal ring inside the bottle that has been suspended by a string.
He asks you if you can think of any way to drop the metal ring inside the bottle without touching the bottle or the cork. Can you think of any way?
Yes there is a way considering if you can find a magnifying glass. Using the bright sunrays, you can then burn away the string allowing the ring to fall down on the bottom of the bottle.
Popular Tricky Picture Death Riddle
AS you can see the picture, all you have to do is analyze it and tell who all from the pictured people will die if the person at E pushes the round object to the slide on the slope. Keep in mind all the physics and the terrain while you analyze the things.
If you notice the animated gif, you know that D, C and B are going to die. D dies directly after coming in contact with the object, C dies after being thrust by the spikes of the see-saw and B dies with the blue ball.
But consider the situation that the person at E stands for Ebola. Eventually A dies as well.
We thank 9gags for this awesome gif.
Science Brain Teaser
A man is trapped on a frozen lake in an isolated region. The frozen surface is frictionless and no grip of any kind can be attained over it. He just has a mobile phone in his pocket but when he takes it out to call for help, he finds out that there is no reception.
There is no wind force that may help him in escaping. What will he do to escape the lake and save himself from freezing to death?
You must have heard about the propelling force or the popular quote: ‘every action has an equal and opposite reaction’.
Here, the man can throw his mobile phone with maximum force on one side and then he will be propelled to the other direction. He will then be able to glide to the other side and escape. The force will be very small but since the surface is frictionless, it will be enough for him.
Magnet Science Puzzle
You are given two metal rods and then taken into a room. You are left there to identify which one of the metal rods you have is a magnet. Now you have no other metal object in the room with you. Also, the two rods are exactly similar to each other in looks.
What method will you use to determine which one of the rods is actually a magnet ?
Now you must be aware of the fact that in general, the magnetic field is present only on the poles of the magnet. Thus keep any rod on a surface. Then hold the other rod in your hand and bring its tip close to the center of the rod that is lying down on the surface. If the rod comes close to the rod you are holding, then the one you are holding is a magnet. However, if the rod does not gets attracted towards your rod, then the one that is lying is the magnet.
Science Riddle For Student
You are given a ball and you are asked to throw it as hard as you can but it must return back to you. It is an open ground and you can’t find any wall or object in your vicinity. There is no one around to catch your ball and throw it back to you. Also, you can’t attach any string or rope with the ball.
But on the contrary, in actual terms, none of them will help in rising the water. They will actually drop the water level. This is because, they have a large effect on the water level while in the boat but when they are dropped into the water. They will drop the water level. Iron brick being the lighter one will drop the water level less because it will have less effect on the water from the boat but will displace the equal amount of water as the gold when it is dropped into the water. Thus it can be said that it will make the water level higher.
Good Science Riddle
Suppose there are two cogwheels in a box. The bigger wheel has twenty four teeth while the smaller one has eight. The bigger one is firmly attached on the center of the box (so it can’t turn or move) and the smaller one rotates around it.
Can you tell the number of times it will turn around the big one when comparing with the box when it turns once?
The correct answer to this twisted problem is four times.
You can try solving the problem with the help of two coins and if you are unable to understand, you may even disassemble some clockwork to find out.
Now to explain it, it is evident that the small one will turn 3 times against the big one. The reason is because it has 8 teeth which is 1/3 of the big one (24). But now we want the big wheel to stop and the small one to turn around the big one. In this process, the small one will make an additional turn on its way around the big one. This makes a total of four turns.
Density multiplied by volume equals mass.
Therefore, Pedro Rodrigues Filho killing mass would mean Pedro Rodrigues Filho was a MASS murderer
Famous Science Brain Teaser
Assume a situation. There is an earthquake which is one point higher on the Richter scale than another earthquake which is ten times powerful. Now how much powerful do you think the earthquake will be if it was just 1/2 a point higher on the Richter scale?
When deepak was six years old he hammered a nail into his favorite tree to mark his height.
Five years later at age eleven , deepak returned to see how much higher the nail was.
If the tree grew by ten inches each year, how much higher would the nail be?
whereas in case of air density medium it will depend on the surface area which is exposed to gravity opposing force.
gravity opposing force will increase as it is coming downwards and the amount of force is directly proportional to the area exposed to it.