Calculate the force exerted by the biceps to hold up the for…
Calculate the force exerted by the biceps to hold up the forearm and a book whose mass m= [m] kg. The pivot point is at the elbow joint. Solution: holding up → rotational equilibrium; Which influences tend to change the state of rotational motion ? Mass of forearm=2.5 kg.τ= F⋅lever arm; τcounterclockwise= τclockwise τbiceps=τbook+τforearm Fbiceps⋅4cm= Weightbook⋅ 40cm +Weightarm ⋅ 15cm
Read DetailsIn order to prevent muscle contraction from mis-aligning bon…
In order to prevent muscle contraction from mis-aligning bones during healing, broken legs must be supported horizontally and kept under tension (traction) directed along the leg. If the leg weighs [w] N, what must be the weight of the hanging mass ? The supporting wires make an angle of 30 degrees with respect to the floor.
Read DetailsHow many meters away is a cliff if an echo is heard one-half…
How many meters away is a cliff if an echo is heard one-half second after the original sound ? Assume that sound travels at 343.0ms. HINT: v=dt Solve for distance; What do we mean by the echo being heard one-half second after the original sound ? A) 86. meters; B) 860. meters; C) 8.6 meters; D) 8600 meters;
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