mass
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Another exercise converting a mass composition to an empirical formula.
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Introduction to the center of mass.
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Estrin explains how it is difficult to reach critical mass in a tough economic environment, which prevents startups from growing enough to compete. She gives a personal example of Precept attempting to enter the market, but not reaching critical mass by the time Microsoft entered the market as well.
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Figuring out the empirical formula from a molecules mass composition.
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Static equilibrium is covered in this lecture, achieved only when the net external force AND net external torque on an object are both zero. A ladder leaning against the wall is analyzed to determine the minimum angle it can make with the floor without sliding. Professor Lewin continues with the topic by discussing how to locate the center of mass of a rigid body. The center of mass always lines up below the point of suspenson such that t...more
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Momentum and its conservation during collisions is introduced. Kinetic energy can decrease or increase during collisions. When kinetic energy is conserved, we call it an elastic collision. The momentum vector, internal forces, external forces and the conservation of momentum are discussed. Professor Lewin does some air track experiments where the released energy is from a compressed spring; kinetic energy increases but momentum is conserve...more
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Fleury talks about establishing and maintaining a critical mass within the market. Without it, he explains, you will find yourself in a very difficult situation and VCs will view you differently.
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This lecture is all about Newton's First (inertia), Second (F=ma) and Third (action=-reaction) Laws. He builds on past discussion of vector forces, moving on to decompose forces in the x and y directions. As the class comes to an end, Professor Lewin ends with a bizarre demo involving two identical strings, one suspending a mass, the other suspending from the mass. Which one breaks when you pull on the lower string, the upper string or t...more
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Figuring out the mass of Oxygen we have.
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Figuring out the molar mass of a mystery molecule at STP.
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Intuition behind the motion of a mass on a spring (some calculus near the end).
