The ball/racket contact time is
about 5–6 milliseconds
, which means that a racket needs to vibrate at a frequency of 166–200 Hz for the direction of racket and ball movement to be the same when they separate.
How long does a tennis ball stay on the strings?
On a 120-mph serve, the ball is in contact with the racquet strings for
about 5 milliseconds
, moving up to 5 in. laterally across the string plane, gathering spin.
What is the average contact force between ball and racket?
What is the average contact force between ball and racket? The huge force exerted by the bat on the ball causes severe distortion of the ball as it is hit. So, during the bat-ball collision, an average force of
roughly two tons
acts during the 0.7 millisecond contact time, with a peak force of about four tons.
What is the IS longest time for a person bouncing a tennis ball on a racket?
The longest time to control a tennis ball on a racket is
5 hr 1 min 8 sec
and was achieved by Christian Roberto López Rodríguez (Spain) in Cabañas de la Sagra, Toledo, Spain, on 22 March 2021. Christian is the first person to break this record in almost four years!
How big is a tennis ball around?
According to the International Tennis Federation, the tennis ball must be yellow or white,
between 2.5 and 2.8 inches in diameter
and between 1.975 and 2.095 ounces in weight.
How much force is exerted on a tennis ball?
Entering these values on our calculator, we find that is equal to
124.26 newtons
. That’s the average force magnitude exerted on the tennis ball.
Why does the ball accelerate away from the bat more than the bat accelerates away from the ball?
Why does the ball accelerate away from the bat more than the bat accelerates away from the ball?
The ball has less mass, so it exerts less force on the bat
. The ball has less mass, so the equal force on the ball and the bat causes greater acceleration on the ball.
What’s the easiest world record to break?
- Most socks put on one foot in 30 seconds. …
- Tallest toilet paper tower in 30 seconds. …
- Fastest time to arrange the alphabet from a can of alphabet spaghetti. …
- Most Smarties eaten in 60 seconds blindfolded using chopsticks. …
- Fastest time to assemble Mr.
What is the world record for not talking?
In December 1963/January 1964, 17-year-old Gardner stayed awake for
11 days and 25 minutes
(264.4 hours), breaking the previous record of 260 hours held by Tom Rounds.
What is the world record for passing a ball?
Giant Ball Passing. Idaho residents David Rush and Seth Lemons currently hold the Guinness World Record of consecutive ball passing by passing a ball between them
4,169 times
– which took over an hour to break. This time it only took three minutes for Guinness to come calling once again.
What do numbers on tennis balls mean?
A common myth among players is that the printed numbers on the tennis balls indicate their bounciness. However,
there is neither a special code nor a meaning related to these numbers
. … When you say “Penn 4!” to the people playing on the next court, they will be able to return the right tennis ball that you own.
Why did tennis balls change from white to yellow?
So the International Tennis Federation (ITF) undertook a study that found that yellow tennis balls were
easier for home viewers to see on their screens
. An official 1972 ITF rule change required that all regulation balls have a uniform surface and be white or yellow in color.
Which ball has largest diameter?
| sport | Bowling | diameter (inches) | 8.500 to 8.595 | diameter (mm) | 215.9 to 218.3 | notes | this is the maximum size |
|---|
Does force affect acceleration?
A net force on an object changes its motion – the greater the net force,
the greater the acceleration
. More massive objects require bigger net forces to accelerate the same amount as less massive objects.
What is the impulse delivered to the ball?
The key here is that the impulse delivered by the floor to the ball
equals the ball’s change in momentum
. To determine the ball’s change in momentum, we have to determine the difference between its velocity upon hitting the floor, and its velocity upon rebounding.
What happens when a tennis racket hits a ball?
When a tennis racquet hits a tennis ball,
the force of the racquet on the ball delivers an impulse to the ball while the ball is in contact with the racquet
. … Figure (a) below shows the general shape of the force curve of the racquet on the ball over time during the impact.
