In 1990 walter arfeuille of belgium lifted a 281.5 kg object through a distance of 17.1 cm using only his teeth. a. how much work did arfeuille do on the object? b. what magnitude force did he exert on the object during the lift, assuming the force was constant?

(a) Work done is 471.74 J

(b) 2.758 kN

Solution:

As per the question:

Mass of the Walter Arfeuille, m = 281.5 kg

Distance, d = 17.1 cm = 0.171 m

Now,

(a) To calculate the work done:

Weight of Walter Afrueille, w = mg =

Work done is given by:

W = mgd = wd

(b) To calculate the magnitude of force exerted by Walter Arfeuille on the object is equal to the his weight:

F = w = mg =

F = 2.758 kN

d is the correct answer

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.