BIO The foot of your average gecko is covered with billions of tiny hair tips—called spatulae—that are made of keratin, the protein found in human hair. A subtle shift of the electron distribution in both the spatulae and the wall to which a gecko clings produces an adhesive force by means of the van der Waals interaction between molecules. Suppose a gecko uses its spatulae to cling to a vertical windowpane. If you were to describe this situation in terms of a coefficient of static friction, μ s , what value would you assign to μ s ? Is this a sensible way to model the gecko’s feat? Explain.
BIO The foot of your average gecko is covered with billions of tiny hair tips—called spatulae—that are made of keratin, the protein found in human hair. A subtle shift of the electron distribution in both the spatulae and the wall to which a gecko clings produces an adhesive force by means of the van der Waals interaction between molecules. Suppose a gecko uses its spatulae to cling to a vertical windowpane. If you were to describe this situation in terms of a coefficient of static friction, μ s , what value would you assign to μ s ? Is this a sensible way to model the gecko’s feat? Explain.
BIO The foot of your average gecko is covered with billions of tiny hair tips—called spatulae—that are made of keratin, the protein found in human hair. A subtle shift of the electron distribution in both the spatulae and the wall to which a gecko clings produces an adhesive force by means of the van der Waals interaction between molecules. Suppose a gecko uses its spatulae to cling to a vertical windowpane. If you were to describe this situation in terms of a coefficient of static friction, μs, what value would you assign to μs? Is this a sensible way to model the gecko’s feat? Explain.
The foot of your average gecko is covered with billions of tinyhair tips—called spatulae—that are made of keratin, the proteinfound in human hair. A subtle shift of the electron distribution inboth the spatulae and the wall to which a gecko clings producesan adhesive force by means of the van der Waals interaction between molecules. Suppose a gecko uses its spatulae to cling to a vertical windowpane. If you were to describe this situation in terms ofa coefficient of static friction, ms, what value would you assign toms? Is this a sensible way to model the gecko’s feat? Explain.
True or False: By rubbing, some objects such as a glass rod or an ebonite rod with silk or fur, a/an repulsive force can be produced. Explain your answer.
A steel bar 1 m long and 0.20 cm in radius is rigidly attached at one end. Attached to the other end is a 20-cm-radius disk that is free to rotate. Suspending a 500-g weight from a cord wrapped around the disc, the load is observed to drop 10 cm.
a) What is the modulus of rigidity of the material of which the bar is made?
b) What is the decrease in potential energy of the charge?
c) What is the elastic potential energy of the bar subjected to torsion?
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8.02x - Lect 1 - Electric Charges and Forces - Coulomb's Law - Polarization; Author: Lectures by Walter Lewin. They will make you ♥ Physics.;https://www.youtube.com/watch?v=x1-SibwIPM4;License: Standard YouTube License, CC-BY