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Billy Rawls
Natural
"Above the Water"
The boat is suspended above the water by two identical straps which are connected to cables at the top of the picture. The weight of the heavy boat is supported because a force is exerted along the straps known as tension; all points of the strap or cable experience the same tension. Newton’s 2nd and 3rd laws can both be applied to the photo. Newton’s 2rd law states that the net force acting on an object is directly proportional to its mass and acceleration (F=ma). Although the object here is not accelerating, that does not mean that the boat is not still experiencing different forces. Due to the fact that the object is at rest, Newton’s 2nd law suggests that the net force on the boat is zero (∑F=0). The third law (forces are equal but opposite in direction) applies here because the tension of the straps counteracts the force of gravity to keep the boat in equilibrium. The weight of the boat, or gravitational force (FG) acting on it, is equal to the mass of the boat multiplied by the acceleration of gravity (9.80 m/s). Therefore, the net force along the y axis is zero because the magnitude of FG equals tension in the y direction; in addition, the net force of zero along the x axis (same tension in opposite directions) allows the boat to stay in equilibrium.
Physics professors Heinrich Jaeger and Sidney Nagel crush a 55-gallon steel drum with air in the room at Physics with a Bang in Chicago, Illinois on Saturday, December 6, 2008.
(Photo by: Beth Rooney/ for the Chicago Chronicle)
THE WEST 70TH STREET SCHEMA
Consciousness has scientists of all kinds scheming. Dr. Piet Hut, a physicist, offers this sketch: the objective world (o), with person and chair; the subjective experience of the world (s), in the balloon; the empirical understanding of the world, including physics (o prime), in the smaller rectangle; and the empirical understanding of subjective experience, including psychology, (s prime), in the small balloon. Dr Hut argues that when s and s prime are conflated, confusion reigns.
New York TImes, Tuesday April 29, 1997
Winter Blues - 16 (of 29) - Canon PowerShot G12 with Extender & Polarizer - Photographer Russell McNeil PhD (Physics) lives on Vancouver Island, where he works as a writer.
This is a good community outreach from the University of Maryland
(cc) Shashi Bellamkonda www.shashi.name Please feel free to use this picture in your blog ,website or presentation and credit as shown. Thanks.
Clemson University students attend an astronomy class, “The Birth of Stars”, taught by Dr. Amber Porter, in the Kinard Laboratory of Physics, Sept. 20, 2016. (Photo by Ken Scar)
Clemson University students attend an astronomy class, “The Birth of Stars”, taught by Dr. Amber Porter, in the Kinard Laboratory of Physics, Sept. 20, 2016. (Photo by Ken Scar)