a) A cube of Jell-0 6 cm on a side sits on your plate. You exert a horizontal force of 0.20 N on the top surface parallel to the surface and observe a sideways displacement of 5 mm. What is the shear modulus of the Jell-O? (b) A molecule in a microwave oven experiences a torque τ = τ0 sin θ. How much work must be done to rotate the molecule from θ = 0° to = 180° ?
(a) A cube of Jell-0 6 cm on a side sits on your plate. You exert a horizontal force of 0.20 N on the
top surface parallel to the surface and observe a sideways displacement of 5 mm. What is the shear
modulus of the Jell-O?
(b) A molecule in a microwave oven experiences a torque τ = τ0 sin θ. How much work must be
done to rotate the molecule from θ = 0° to = 180° ?
(c) The evolution of a star depends on its size. If a star is sufficiently large, the gravity forces
holding it together may be large enough to collapse it into a very dense object composed mostly
of neutrons. The density of such a neutron star is about 1014 times that of the earth. Suppose that
a star initially had a radius about that of our sun, 7 × 108 km, and that it rotated once every 26 days,
as our sun does. What would be the period of rotation (the time for 1 rev) if the star collapsed to a
radius of 15 km?
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