100 joules
100 JEnergy · definition
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Energy
Just how much energy is 100 joules?
A little work
100 J
ENERGY STORED OR TRANSFERRED
100 joules
The quantity is exact as entered.
100 JEnergy
0
Tennis ball serve kinetic energy
Tennis ball serve kinetic energy is the amount of energy a tennis ball has due to its motion immediately after being struck during a serve.
120 JDefined launch kinetic energy
0
Bar length represents energy. Equal energy does not imply the same temperature, power or usefulness.
A little perspective
The kinetic energy of a served tennis ball is about 1.2 times 100 joules.
Measurements, assumptions & sources +
100 joules
Energy: 100 J; definition.
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Tennis ball serve kinetic energy
Defined launch kinetic energy: 120 J; derived calculation; range 60 J–180 J.
A defined 120 J serve model, corresponding to a 57.7 g regulation tennis ball moving at about 64.5 m/s, using E = ½mv². Ball mass and launch speed determine the result.
The marked defined launch kinetic energy is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
Compare 100 joules with the kinetic energy of a served tennis ball. The notes below explain how each value was chosen.
Tennis ball serve kinetic energy
120 JDefined launch kinetic energy · derived calculation · range 60 J–180 J
A defined 120 J serve model, corresponding to a 57.7 g regulation tennis ball moving at about 64.5 m/s, using E = ½mv². Ball mass and launch speed determine the result.
- Comparing
- Energy ↔ Defined launch kinetic energy
- Relative size
- The kinetic energy of a served tennis ball is about 1.2 times 100 joules. The kinetic energy of a served tennis ball is approximately 20% greater than 100 joules.
How to read the visual
The diagram uses the recorded measurements. Details outside the marked spans do not set the scale.
- We use 120 J for the kinetic energy of a served tennis ball; the recorded range is 60 J–180 J.
- The kinetic energy of a served tennis ball: This is calculated from stated inputs and assumptions, not a direct measurement.
- The recorded ranges overlap, so the ordering can vary even though the central values differ.
Energy is an amount; power describes the rate of energy transfer or use.
2.7778 × 10⁻⁵ kWhkilowatt-hours
0.023901 kcalkilocalories
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