The outer surface of the glass expands faster than the inside surface since glass is a fairly good thermal insulator. The outer surface tries to expand without the inner surface doing so at the same time. This is the secret of Pyrex glass. It is more conductive to heat and the inner and outer surface expand (and contract) at the same time.
Moment about D=0
or,T1*6a-5w*3a-9w*2a=0
T2+T1=5w+9w
Distance between the focal point and the center of the lens
Answer:
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Explanation:
Answer:
249003822308.05008 N
Explanation:
F = Force
= Breaking stress of bone = 150 MPa
= Outer diameter = 3.6 cm
= Inner diameter = 2.3 cm
Area of the bone is assumed to be a hollow cylinder

Stress is given by

The maximum weight the person can lift without breaking his legs is 249003822308.05008 N