Monthly Archives: July 2014

Tang Ad — July 26 marks the passing of William “Bill” Mitchell. Mitchell was an American food chemist and prolific inventor. Most people won’t recognize his name, but you may recognize his inventions. He is the man responsible for Cool-Whip, Tang, Pop Rocks, powdered egg whites and quick-set Jello. He has over 70 […]

Today In Science History – July 26 – Chemist Bill ...

This entry was posted on July 25, 2014 by Todd Helmenstine (updated on November 14, 2021)

Test Tubes — July 25 is Louise Joy Brown’s birthday. Louise was the first successful ‘test tube baby’ human to be born. She was born July 25, 1978 by planned caesarean section to John and Lesley Brown at in Oldham General Hospital, Greater Manchester, UK. She weighed in at 5 lbs 12 ounces. […]

Today In Science History – July 25 – First Test ...

This entry was posted on July 24, 2014 by Todd Helmenstine (updated on June 21, 2021)

friction 5 — Friction is the resistance force generated between two bodies as they move across each other. It is proportional to the force that presses the two bodies together. This diagram shows the forces acting on a block sitting on a surface. The block is pulled down onto the surface by the […]

Friction Example Problem – Physics Homework Help

This entry was posted on July 24, 2014 by Todd Helmenstine (updated on April 8, 2026)

Apollo 11 Splashdown — On July 24, 1969 the crew of Apollo 11 returned safely to Earth from their historic trip to the Moon. The command module of Apollo 11 Columbia re-entered the atmosphere and parachuted into the Pacific Ocean. They landed upside down and had to be righted by the astronauts using flotation pods. […]

Today In Science History – July 24 – Return From ...

This entry was posted on July 23, 2014 by Todd Helmenstine (updated on November 5, 2025)

equilibrium problem 2 — Equilibrium is a special case in mechanics where all the forces acting on a body equal zero. This type of problem pops up in many situations and is important in engineering and physics. This equilibrium example problem illustrates how to determine the different forces acting on a system of forces acting […]

Equilibrium Example Problem – Physics Homework Example

This entry was posted on July 23, 2014 by Todd Helmenstine (updated on June 21, 2021)

July 23 marks the passing of Sir William Ramsay. Ramsay was a Scottish chemist who was responsible for discovering the elements that make up most of the right hand edge of the periodic table — the noble gases. Ramsay collaborated with Lord Rayleigh who had noticed a difference in density between […]

Today In Science History – July 23 – William Ramsay ...

This entry was posted on July 22, 2014 by Todd Helmenstine (updated on June 21, 2021)

Fractions — Fractions are an important part of science mathematics. A fraction is a representation of one number divided by another. On paper, they are written with two numbers arranged vertically with a line separating them. The top number (numerator) is divided by the bottom number (denominator). One half is 1 divided by 2 and […]

Writing Fractions In HTML

This entry was posted on July 22, 2014 by Todd Helmenstine (updated on May 1, 2022)

Projectile motion problem setup illustration — Throwing or shooting a projectile follows a parabolic course. If you know the initial velocity and angle of elevation of the projectile, you can find its time aloft, maximum height or range. You can also its altitude and distance travelled if given a time. This example problem shows how to […]

Projectile Motion Example Problem – Physics Homework Help

This entry was posted on July 22, 2014 by Todd Helmenstine (updated on March 4, 2025)

Wiley Post — On July 22, 1933, Wiley Post completed the first solo flight around the world. Wiley Post was already famous for setting a speed record for flying around the world with his co-pilot Harold Gatty two years prior. The two men flew the 15,474 round trip in the Winnie Mae, a […]

Today In Science History – July 22 – Wiley Post’s ...

This entry was posted on July 21, 2014 by Todd Helmenstine (updated on June 21, 2021)