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.
- My instructor told me that the wavelength of laser light is determined by the distance between the mirrors in the laser device. I say he is not correct, it is the nature of the lasing medium itself as the molecules that make it up emit characteristic wavelenghts when excited. Which of us is correct?
- Why is gold such a soft material compared to something like iron?
- How do scientists determine the viscosity of lava?
- Why is there discussion as to whether or not glass is a liquid or a solid?
- Why does the light from a sodium lamp appear orange?
- How do scientists know there are such things as atoms?
- Why is the sky blue?
- Why are some lights called Halogen Lights? Do they contain elements from the Halogen group?
- I have heard of ways to get energy through the braking of a car. How does this work?
- What is blood made out of? If you wanted to make blood, what ingredients would you need?