A wheelbarrow is an example of which class of level? 1^st 2^nd 3^rd not a lever

Question

A wheelbarrow is an example of which class of level? 1^st 2^nd 3^rd not a lever The amount of torque which must by generated by the biceps brachia at the elbow in order to maintain the arm in a particular position is 50 Nm. If the biceps attaches to the radius at a perpendicular distance of 3 cm from the joint center at the elbow, how much force must the muscle produce? 1667N 17 N 150 N 1.5 N Which of the following must be true for an object to be in a state of static equilibrium? the sun, of all vertical forces acting on object must be equal to zero the sum of all horizontal forces acting on the object must be equal to zero the sum of all torques acting on the object must be equal to zero all of the above must be true Which of the following does not increase stability? lower the COG increase size of base of support decrease mass increase friction Which of the following will benefit mobility? increase mass increase base of support increase friction raise center of gravity What is the importance of segmental center of mass to the lever systems of the human body? segmental COM will follow a parabolic path when projected segmental COM is the point of resistance (where weight vector is drawn) and therefore determines the length of the resistance arm both A and B none of the above

Explanation / Answer

23. B

explanation:

A common example of a second class lever is a wheelbarrow, where the load is in the basin, the pivot being the wheel, and the effort being on the handles where the wheelbarrow is lifted up.
There are also second class levers in your body like the ankle. Answer Two other examples of a second class lever are a car door and a bottle opener

24. A)1667N

25. D) all of the above

the object will be in equilibrium if sum of all the vertical and horizontal forces will be zero and torque should also zero

26. C)decrease mass

27.D) raise center of gravity

explanation:

• Height of the center of gravity above the base of support: When you squat down to improve your stability, you lower your center of gravity, or decrease the height of the center of gravity above the base of support. Conversely, standing up straight raises the center of gravity above the base of support and decreases stability

high stability (low mobility) is characterized by a large base of support, a low center of gravity, a centralized center of gravity projection within the base of support, a large body mass, and high friction at the ground interface. Low stability (high mobility), in contrast, occurs with a small base of support, a high center of gravity, a center of gravity projection near the edge of the base of support, a small body mass, and low friction

28. B)segmental COM is the point of resistance and there for determines the length of the resistance of arm

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