9. which of the following is an example of a class iii lever system?
hammer claws
wheelbarrow
can opener
bicep curl

The bicep curl is the example of class III type of levers.

Explanation:

Levers are divided into three types based on where the effort and load are situated with respect to fulcrum. They are class one lever, class two lever and class three lever. In the above examples, the bicep curl is the best example for the class three lever.

In class three lever between fulcrum and load the effort is located, the bicep curl is used by the human beings for exercise here the effort applied is by the bicep muscle is between the elbow joint that acts as fulcrum and load is in hands.

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

the higher the current the higher the mag field around it the higher the influence on the compass