Paul Andersen explains how the gravitational field strength is directly related to the mass of the object and indirectly related to the square of the distance from the center of mass. The equation for gravitational field strength was discovered by Sir Isaac Newton and contains a gravitational constant.
Inflatable Heat Shields Could Drop-Ship Bigger Robots
The Hypersonic Inflatable Aerodynamic Decelerator, or HIAD, is rigorously tested in NASA’s Armstrong Flight Research Center. This technology is being developed to deliver larger payloads to planets more efficiently.
A team of solar thermal engineers and scientists at our Energy Centre in Newcastle have used the ample sunlight flooding their solar fields to create what’s called ‘supercritical’ steam — an ultra-hot, ultra-pressurised steam that’s used to drive the world’s most advanced power plant turbines — at the highest levels of temperature and pressure EVER recorded with solar power.
How is it possible to jump out of a plane and survive? We sent Ross Exton of the Live Science Team up to 15,000ft to find out…
Black hole Firewalls with Sean Carroll and Jennifer Ouellette
What would you experience if you jumped into a black hole?
Conventionally, physicists have assumed that if the black hole is large enough, the gravitational forces won’t become extreme until you approach the singularity. There, the gravitational pull will be so much stronger on your feet than your head, that you will be ‘spaghettified’. Now, a new theory proposes that instead of spaghettification, you will encounter a massive wall of fire that will incinerate you on the spot, before you get close to turning into vermicelli.
In this special Ri event, science writer Jennifer Ouellette and physicist Sean Carroll explore the black hole firewall paradox, the exotic physics that underlies the new theory and what the paradox tells us about how new scientific theories are proposed, tested and accepted.
Paul Andersen explains how an object with mass placed in a gravitational field experiences a gravitational force. On the Earth this gravitational force is known as weight. The gravitational force is equal to the product of the mass and the gravitational field strength.
Who needs goal-line technology when you have physics? Watch as Andy explains how a little bit of physics could’ve proved that Lampard’s disallowed 2010 world cup goal went in.
In a crucial World Cup 2010 knock-out match, with the game in the balance, Frank Lampard scored a beautiful goal from outside the area. It thwacked the underside of the crossbar, bounced inside the goal, and then bounced back out.
But the celebrations were over before they had even begun. Neither the referee nor linesman thought the ball had crossed the line. No goal was given, play continued, and England ultimately crashed out of the competition.
Goal-line technology is the solution many called for, but perhaps there was a simpler option: teach referees a bit of physics. Here, Andy returns to the Ri Prep Room to use a simple demo to explain how the spin of the ball made it bounce out of the goal, and why the referees shouldn’t have needed any technology to know it was a goal.