Which part of vernier caliper is used to measure external diameter of cylinder?
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The lower jaws present in the vernier callipers is used to measure the external diameter or thickness of pencils etc...

0.407 kg

Explanation:

Given :

Coefficient of static friction, µs = 0.276

Force, F = 1.1 N

Using the relation :

μ = F/N

N = normal reaction ; N = mg

μ = F / mg

g = acceleration due to gravity = 9.8 m/s²

0.276 = 1.1 / m * 9.8

0.276 = 1.1 / 9.8m

0.276 * 9.8m = 1.1

2.7048m = 1.1

m = 1.1 / 2.7048

m = 0.4066844

Mass = 0.407 kg