Learning goal: to understand the conditions necessary for static equilibrium. look around you, and you see a world at rest. the monitor, desk, and chair—and the building that contains them—are in a state described as static equilibrium. indeed, it is the fundamental objective of many branches of engineering to maintain this state in spite of the presence of obvious forces imposed by gravity and static loads or the more unpredictable forces from wind and earthquakes. the condition of static equilibrium is equivalent to the statement that the bodies involved have neither linear nor angular acceleration. hence static mechanical equilibrium (as opposed to thermal or electrical equilibrium) requires that the forces acting on a body simultaneously satisfy two conditions: ∑f⃗ =0 and ∑τ⃗ =0; that is, both external forces and torques sum to zero. you have the freedom to choose any point as the origin about which to take torques. each of these equations is a vector equation, so each represents three independent equations for a total of six. thus to keep a table static requires not only that it neither slides across the floor nor lifts off from it, but also that it doesn't tilt about either the x or y axis, nor can it rotate about its vertical axis.
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Physics, 22.06.2019 00:50
While goofing off at the ice skating rink, a student takes off her shoes and places each of them on the ice. her friend, a hockey player, then shoots a hockey puck at each shoe. the first puck immediately comes to rest after it collides with the left shoe. the second puck rebounds after it collides with the right shoe. if each hockey puck has the same incoming speed, which shoe has greater speed after the collision? the right shoe. both shoes have the same speed. the left shoe.
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Physics, 22.06.2019 14:30
In order to do work, the force vector must be question 1 options: in a different direction than the acceleration vector. in a different direction than the displacement vector. in the same direction as the displacement vector and the motion. in the same direction as the acceleration vector.
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Physics, 22.06.2019 17:20
Which is not true of the intertropical convergence zone? a) it features heavy precipitation b) it's where the trade winds collidec) it's a high-pressure zone with sinking air d) it is also known as the doldrums
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Learning goal: to understand the conditions necessary for static equilibrium. look around you, and...
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