Archives of Ask A Scientist!
About "Ask A Scientist!"
On September 17th, 1998 the Ithaca Journal ran its first "Ask A Scientist!" article in which Professor Neil Ashcroft , who was then the director of CCMR, answered the question "What is Jupiter made of?" Since then, we have received over 1,000 questions from students and adults from all over the world. Select questions are answered weekly and published in the Ithaca Journal and on our web site. "Ask A Scientist!" reaches more than 21,000 Central New York residents through the Ithaca Journal and countless others around the world throught the "Ask a Scientist!" web site.
Across disciplines and across the state, from Nobel Prize winning scientist David Lee to notable science education advocate Bill Nye, researchers and scientists have been called on to respond to these questions. For more than seven years, kids - and a few adults - have been submitting their queries to find out the answer to life's everyday questions.
When you hit a baseball or softball, the bat imparts kinetic energy onto the ball, causing it to launch onto the field. However, the ball also imparts energy onto the bat! Some of this energy goes into rotating the bat about a pivot point. Imagine a stick floating in a tub of water. If you push down on the stick near one of its ends, it will rotate. The same thing happens to a bat when it comes into contact with a ball. It tries to rotate and in the process, it pushes against your hands!
But this is only part of why hitting the ball can really sting. Some of the ball's energy also goes into vibrating the bat. When you tap a tuning fork, what happens? You can see (and hear) the prongs of the tuning fork vibrate in response. A baseball bat reacts similarly when it hits a ball. The bat can vibrate at frequencies around 200 Hz, and the vibrations near your hand can sting! Interestingly, if you hit the ball at a particular spot on the bat, the vibrational waves that propagate along the bat will cancel each other out. When this happens, you don't feel any vibrations in your hands (so they don't hurt as much). Furthermore, energy is no longer lost in the form of bat vibrations, so the ball can travel much farther! This spot on the bat is sometimes called the sweet spot.
Have you noticed that on a cold day, hitting a baseball or softball hurts a lot more? This is because colder balls are less elastic, so more energy is transferred into vibrating the bat (instead of deforming the ball). This also explains why rubber balls (like lacrosse balls) hurt a lot less when you hit them with a bat.
So if you want to avoid the stinging pain of hitting a baseball or softball, just make sure to only play on warm days and always hit the ball on the sweet spot of the bat. Easier said than done, right? And they say baseball players aren't tough.
- If hydrogen and oxygen are both flammable why doesn't water burn?
- Where does liquid nitrogen come from and how is it made?
- If solids, like glass and ice, are made of tightly packed molecules, how can we see through them?
- Why does the earth have more water than land?
- If photons have no mass, and you can make an atom laser, instead of an optical one. Would it be possible to attach matter or a small machine to a beem of light and make it travel long distances at light speed?
- Water doesn't spoil, but why do some water bottles have expiration dates?
- How do lasers in machines work?
- Why are computer chips written on silicon?
- Where does the chlorine from pools go when the water evaporates? Does this harm the ozone?
- In an accelerator when an electron and positron collide, for a short time they form pure energy. Where does the energy come from if energy can't be created or destroyed and where does the matter go?