The bolts on the cylinder head of an engine require tightening to a torque of 68

ID: 1416348 • Letter: T

Question

The bolts on the cylinder head of an engine require tightening to a torque of 68 mN .(Figure 1)

Part A

If a wrench is 28 cm long, what force perpendicular to the wrench must the mechanic exert at its end?

Express your answer to two significant figures and include the appropriate units.

243N

Part B

If the six-sided bolt head is 15 mm in diameter, estimate the force applied near each of the six points by a socket wrench.

Express your answer to two significant figures and include the appropriate units.

(I just need part B)

Here,
radius, r = 15/2 = 7.5 mm = 0.0075 m

Torque, t = force * perpendicular distance
t = F*r*Sin90 ( F is force, r distance to centre)

68 = F*0.0075

F = 9066.67 for all six faces

so for each face, F = 9066.67 / 6 = 1511.11 N

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