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Spiders may "tune" strands of their webs to give enhanced response at frequencies corresponding to the frequencies at which desirable prey may struggle. Orb web silk has a typical diameter of 0.0020mm, and spider silk has a density of 1300kf/m^3 .To give a resonance at 200Hz , to what tension should a spider adjust a 18cm long strand of silk?
question1calculate the intensity distribution in a standing evanescent wave above a glassair interface created by
a straight wire lies along the y-axis initially carrying a current of 10 a in the positive y-direction. the current
A spherical capacitor consists of two concentric spherical metal shells and has a radius a for the outer sphere and b for the inner sphere. Calculate the capacitance.
estimate the magnitude of the electric field due to the proton in a hydrogen atom at a distance of 5.29 10-11 m the
A plane drops a package of food to stranded caribou on an ice flow in the Artic circle. How far short of the target should it drop the package
A skier of mass 120 kg starts from rest at the top of the ski slope of height 100 m, find the skier's speed when he reaches the bottom of the slope
questiona known toy consists of an aligned row of identical steel balls that are suspended bynbspmono?lament so they
A 200 keV electron strikes a copper target and is brought to rest producing a single X-ray photon. What is the Compton scattering angle relative to the direction of the incident X-ray
A toaster uses a heating wire. When the toaster is turned on at22 °C, the initial current is 1.19 A. A few seconds later, thetoaster warms up and the current has a value of 0.927 A. The average temperature coefficient of resistivity for this wire ..
A rock of mass 42 kg accidentally breaks loose from the edge of a cliff and falls straight down. What is the magnitude of the acceleration of the rock
What is the attractive force between the protons. A rocket rises vertically, from rest, with the acceleration of 3.0 m/s2 until it runs out of fuel at an altitude of 1100 m. After this point, its acceleration is that of gravity, downward.
A child playing in a swimming pool realizes that it is easy to push a small inflated ball under the surface of the water while a large ball requires a lot of force
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