Why does this ping-pong pong ball get sucked in, when I blow out through this toy tube? |
- Why does this ping-pong pong ball get sucked in, when I blow out through this toy tube?
- Does the human brain develop physically or is it capable of adult level thought at birth (limited only by education and experience)?
- Why do multi-plate clutches in cars have high friction if surface area doesn't affect friction force?
- Does gradual cold exposure(cold showers, ice baths,etc.) Increase your blood circulation over time?
- Would nocturnal animals see the night sky like a camera taking a long exposure?
- If I'm phoning an alien in another galaxy, whose relative position is unknown, is it possible to tell them what we mean by left and right just by talking?
- How does a car determine its speed?
- Does gas actually get cooler when it expands in vacuum?
- If AIDs is caused by transmission of bodily fluids, how did the first affected person get the disease?
- Would this theory work with a bowling ball and quarter?
- Why can my apple juice last until 2017?
- Since moons can be larger than planets, have magnetospheres, tectonic activity, and substantial atmospheres (e.g. certain moons in our own solar system), is there any reason not to consider moons in our hunt for habitable 'planets'?
- Is human control of weather impossible?
- Why is the glucose level in the blood bi-phasic postprandial?
- Why is it that when exposure to battery acid it deadly, but we eat citrus that has almost the same pH value?
- Physiologists, what is the science behind loss of range of motion due to lack of use?
- Why doesn't blood reproduce out of body if given proper oxygen + nutrients?
- Why do some objects feel colder/warmer than others while being at the same temperature?
- What determines when brakes lock up instead of slowing a vehicle down even faster?
- How is it possible that energy and mass are conserved entities when radioactive decay occurs?
- What is the formal oxidation number for Fe in oxyhemoglobin?
| Why does this ping-pong pong ball get sucked in, when I blow out through this toy tube? Posted: 31 Oct 2015 09:16 PM PDT When I place a ping-pong ball on one end of this toy, and blow hard on the other end, I would think it would shoot the ping-pong ball. But instead, it actually sucks in the ping-pong ball enough to prevent it from falling due to gravity. Why does it do this? Whatch this video https://youtu.be/Z_6ef3L0eE8 [link] [111 comments]  |
| Posted: 31 Oct 2015 08:09 PM PDT |
| Posted: 31 Oct 2015 08:53 PM PDT A multi-plate clutch has a larger frictional force than a single plate clutch with the same spring (normal force) pushing on it. Since the material for both types of clutches (coefficient of friction) remains the same and the spring (normal force) remains the same shouldn't the friction force remain the same as well? [link] [5 comments]  |
| Does gradual cold exposure(cold showers, ice baths,etc.) Increase your blood circulation over time? Posted: 31 Oct 2015 02:03 PM PDT It seems to spike your metabolic rate, at least that is what I heard. Anyone know if it helps with blood circulation as well? [link] [20 comments]  |
| Would nocturnal animals see the night sky like a camera taking a long exposure? Posted: 31 Oct 2015 11:39 AM PDT Would something like an owl see the sky like this... http://m.imgur.com/1r6Zv4D? Photo credit Anton Jankovoy [link] [5 comments]  |
| Posted: 01 Nov 2015 05:32 AM PST |
| How does a car determine its speed? Posted: 31 Oct 2015 04:55 PM PDT I was thinking it can't be a simple revolution counter of the wheel, because if you change the size of the wheel the distance covered will be different. So how does the car "calculate" its speed accurately? [link] [22 comments]  |
| Does gas actually get cooler when it expands in vacuum? Posted: 01 Nov 2015 03:58 AM PST For example if I puncture a gas tank, it cools down since escaping the gas is working against the pressure of the environment and the energy is taken away from the internal energy of the gas. The work done by gas is taken away from the internal energy of the gas --> T drops. However if I take the tank to interstellar space where there is nothing for the escaping gas to push against, then the work done by expanding gas (pressure times change in volume) is 0 too and the temperature of the gas stays the same. Is it actually so? [link] [8 comments]  |
| Posted: 31 Oct 2015 06:34 PM PDT From what I've learned in health class in the past, it seems that HIV involves someone who already has the disease. If this is the case, how did the disease start? I mean, if Brandon (hypothetically speaking) was the first guy to ever have AIDs, how did he get it? [link] [9 comments]  |
| Would this theory work with a bowling ball and quarter? Posted: 31 Oct 2015 08:45 PM PDT http://i.imgur.com/HJb9V8E.gifv What would it take for me to lift a bowling ball up with a quarter? What would be feasible? I want to have something to show my kids and I could use my whole back yard. [link] [5 comments]  |
| Why can my apple juice last until 2017? Posted: 31 Oct 2015 09:54 PM PDT |
| Posted: 31 Oct 2015 02:12 PM PDT It seems like they can quack like planets but nonetheless get sort of written off when thinking about places where life could flourish or even places humans could colonize in the distant future. Should programs like Kepler consider moons too? [link] [5 comments]  |
| Is human control of weather impossible? Posted: 31 Oct 2015 10:07 PM PDT |
| Why is the glucose level in the blood bi-phasic postprandial? Posted: 31 Oct 2015 12:31 PM PDT Take a look at this graph from wiki. After every meal there is a glucose spike along with insulin, followed slightly thereafter by another minor spike. What is this caused by? My best guess was that the amount of glucose available after initial breakdown obviously caused the first spike, the second spike would be caused by glucose formed in the colon by bacterial breakdown of initially unabsorbable nutrients into absorbable foodstuffs? [link] [5 comments]  |
| Posted: 31 Oct 2015 02:29 PM PDT Everyone knows that skin exposure to battery acid would be extremely harmful with its pH value of 1, but why is there a lot less of a negative effect from eating citrus like a lemon which has a pH value of two? Does it only become dangerous around that level, what makes one kind of acid more dangerous than another? [link] [4 comments]  |
| Physiologists, what is the science behind loss of range of motion due to lack of use? Posted: 31 Oct 2015 02:12 PM PDT I've heard 'use it or lose it' when it comes to range of motion, especially in reference to people working out, ie quarter-squats, etc. What causes the muscle fibers to become harder to stretch? [link] [1 comment]  |
| Why doesn't blood reproduce out of body if given proper oxygen + nutrients? Posted: 31 Oct 2015 08:40 PM PDT |
| Why do some objects feel colder/warmer than others while being at the same temperature? Posted: 31 Oct 2015 08:36 PM PDT |
| What determines when brakes lock up instead of slowing a vehicle down even faster? Posted: 31 Oct 2015 01:39 PM PDT I understand brakes convert kinetic energy into thermal energy. What I don't know is what causes them to lock up. Probably a combination of factors between tires and brakes ect. Thank you! [link] [4 comments]  |
| How is it possible that energy and mass are conserved entities when radioactive decay occurs? Posted: 31 Oct 2015 11:33 AM PDT Gamma radiation consists of high-energy photons, for instance. If an atom is decaying and releases gamma radiation, how is its energy/mass not lower? It seems intuitive to me that if an atom decays, gamma radiation happens, and then say the gamma radiation happens to ionize a molecule and break a chemical bond, that would require some energy source. What am I missing? [link] [2 comments]  |
| What is the formal oxidation number for Fe in oxyhemoglobin? Posted: 31 Oct 2015 09:10 AM PDT I've had several different answers from my sources so I thought I'd ask here. Some sources state that the Fe must stay as Fe(II) as otherwise the oxidised Fe(III) would form which would not suit the molecule's function. However, I've also read that it is in fact, Fe(III), bonded to oxygen in a 'superoxide' state. Which of the two is correct and why? Apologies if I've unwittingly broken any Reddit rules, it's my first time posting and I'm on mobile. [link] [5 comments]  |
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