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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?
in a certain region of space electric field is along the z-direction throughout. the magnitude of electric field is
In a new (inelastic) collision, the same two bumper cars with the same initial velocities now latch together as they collide. What is the final speed of the two bumper cars after the collision
Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of the orbit is 4.41 × 10-11 m. Determine the magnitude..
A 36 kg girl and a 7.9 kg sled are on the frictionless ice of a frozen lake, 20 m apart but connected by a rope of negligible mass. How far from the girl's initial position do they meet
A mechanic turns a wrench using a force of 25 N at a distance of 16cm from the rotation axis. What is the magnitude torque does she apply to the wrench
A ball thrown straight up at an initial speed of 14.0m/s reaches a maximum height of 7.6m. What fraction of the ball's initial kinetic energy is dissipated by air resistance as the ball moves upward?
A drag racer starts from rest and accelerates for 12.3 s with a constant acceleration until it has travelled 400 m. What is the stopping distance for the drag racer
suppose a cube of aluminum which is 1.00 cm on a side accumulates a net charge of 2.70 pc.a what percentage of the
An ideal gas expands at a constant total pressure of 3.0 atm from 400 mL to 600 mL. heat then flows out of the gas at a constant volume, and the pressure and temperature are allowed to drop until the temperature reaches its original value.
A puck (mass m1 = 1.30 kg) slides on a frictionless table as shown in the figure below. The puck is tied to a string that runs through a hole in the table and is attached to a mass m2 = 3.9 kg. What is the change in the kinetic energy of the puck
A 280 g block on a 50.00 cm-long string swings in a circle on a horizontal, frictionless table at 70 rpm.
The sound level in the middle of a rave is 90.0 dB. What is the sound intensity at this location
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