This movement of air over the surface of the wing generates lift, the force that counters gravity and keeps the glider aloft. Once aloft, gravity (the weight of the hang glider and pilot) pulls the glider back toward Earth and propels the glider forward, continually causing air to flow ...
Since specific gravity is a ratio of the density of a solid or liquid to the density of water, all you have to do to find the density, given the specific gravity, is to multiply the specific gravity by the density of water. If you're looking for density in pounds per gallon, you ne...
The water in the bathtub then pushes up on the jug with a little more than 8 pounds of force, the weight of a gallon of water. An object with greater volume is pushed up with greater force because it displaces more fluid. Of course, if the object is denser (and therefore heavier) ...
Thrust is measured in "pounds of thrust" in the U.S. and in Newtons under the metric system (4.45 Newtons of thrust equals 1 pound of thrust). A pound of thrust is the amount of thrust it would take to keep a 1-pound object stationary against the force of gravity on Earth. So on...
this push and gravity are the bob's only sources of speed for the entire race. During the push-off, any ballast that the team has added to bring the bobsled up to the maximum weight is a liability. Even though there is very little friction, a heavier bob is harder to push.[source:...
When a rocket's engine develops enough power, the thrust force pushing it upward will be bigger than its own weight (the force of gravity) pulling it down, so the rocket will climb into the sky. As the rocket climbs, air resistance (drag) will try to pull it back too, fighting ...
Every object on Earth has weight, a product of both gravity and mass. A Boeing 747-8 passenger airliner, for instance, has a maximum takeoff weight of 487.5 tons (442 metric tons), the force with which the weighty plane is drawn toward the Earth. Weight's opposing force is lift, which...
In an ordinary camera assembly, the center of gravity is inside the camera itself. When you spread out the components, the center of gravity falls between the various pieces of equipment, along the sled pole. In a Steadicam, the articulated arm's gimbal grips the sled pole just above the ...
Hydraulic presses can exert many thousands of pounds of force, making them useful for industrial operations such as forming metal parts. You typically measure hydraulic pressure in pounds per square inch (psi), which is force per unit area. To calculate the force produced, multiply the pressure ...
At 18, Katie Stubblefield lost her face. At 21, she became the youngest person in the U.S. to undergo the still experimental surgery. Follow her incredible story.