Historians claim that mechanization (development of the cotton gin) was responsible for preservation of the institution of slavery in the American South
Discuss the possibility that they could be correct or incorrect, and try to find evidence to support your thesis.
The historians are on to something important. The machine saved much human
labor, but allowed the crops to become much bigger (because the bottleneck of picking the
seeds out by hand was eliminated). More cotton meant more profit. More profit meant still
more cotton was planted. The glut of cotton led to further mechanization of the making of
cloth in the industrialized world, but in the American south the increase led to an explosion
of work, leading to importation of more slaves to do that work in the forbidding climate.
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A solid steel sphere with a radius of 2.0 m falls off a ship and sinks to a depth where the pressure is 15 MN/m2. The bulk modulus for this steel is 1.6 × 1011 N/m2. What is the change in the radius of the sphere?
A) -0.021 mm B) -4.2 mm C) -0.42 mm D) -0.19 mm E) -0.062 mm
A system of a proton and a neutron has a net charge of
a. +1.6 × 10^-19 C. b. –1.6 × 10^-19 C. c. 3.2 × 10^-19 C. d. zero.
__________ is the collective name given for particles that interact via the strong force
Fill in the blank(s) with correct word
Limestone may be metamorphosed into
A) schist. B) marble. C) quartzite. D) gneiss.