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A boat, whose speed in still water is 1.70 m/s, must cross a 260m wide river and arrive at a point 110m upstream form where it starts. to do so, the pilot must head the boat at a 45 degree upstream angle. What is the speed of the river's current?
Plane-polarized light passes through two polarizers whose axes are oriented at 37.0 degrees to each other.If the intensity of the original beam is reduced to 14.55 , what was the polarization direction of the original beam, relative to the first pola..
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. What is the orbital period of the faster planet
Modeling the optical trap as a Hookean spring, evaluate the trap stiffness using the Boltzmann distribution. Determine the sphere diameter by comparing the Stokes drag and the tweezer force that balances the drag.
Neutron stars consist only of neutrons and have unbelievably high densities. Find the density of such a star
A 190 pF capacitor is charged to a potential difference of 120 V, and the charging battery is disconnected. The capacitor is then connected in parallel with a second (initially uncharged) capacitor. If the measured potential difference drops to 100 V..
The lines in a grating are uniformly spaced at 1520nm. Analyse the angular separation of the second order bright fringes between light of wavelength 603nm and 615.4 nm. Reply in units of mrad.
A bowling ball weighing 71.2 is attached to the ceiling by a 3.80 rope. The ball is pulled to one side and released; it then swings back and forth like a pendulum. As the rope swings through its lowest point, the speed of the bowling ball is measured..
Light from a sodium lamp with a wavelength in a vacuum of 590 nm enters diamond in which the speed of light is 1.24 108 m/s. What is the wavelength of this light in diamond
A positron undergoes a displacement ?r = 8.0 ihat - 8.0 jhat + 6.0 khat, What was the positron's former position vector
1)A crate of potatoes of mass 19.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.82 and μk = 0.29. Find the frictional force (magnitude and direction) on the crate if the crate is sliding d..
the earth has a mass of 5.98 1024 kg. the average mass of the atoms that make up the earth is about 40 u. based on this
A solenoid 24.0cm long and with a cross-sectional area of 0.600cm^2 contains 420 turns of wire and carries a current of 75.0 A. Calculate the magnetic field in the solenoid
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