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A 110-m-wide river flows due east at a uniform speed of 4.9 m/s. A boat with a speed of 7.0 m/s relative to the water leaves the south bank pointed in a direction 25o west of north. What is the (a) magnitude and (b) direction of the boat's velocity relative to the ground? Give the direction as the angle of the velocity from due north, positive if to the east and negative if to the west. (c) How long does it take for the boat to cross the river? number and units.
lucite has index of refraction 1.49. the brewster's angle is56.1o. if unpolarized light is incident on the surfaceof a piece of lucite at this angle, describe the degree ofpolarization of the reflected light.
the temperature t in a metal ball is inversely proportional to the distance from the center of the ball which we take
A beam of electrons is incident on two slits separated by a distance of 2.0E-6m. Calculate the kinetic energy of the electrons
A dentist's drill starts from rest. After 2.90 s of constant angular acceleration it turns at a rate of 2.0 multiply.gif 104 rev/min. Determine the angle (in radians) through which the drill rotates during this period
A piece of tin has a mass of 25g and a volume of 4.3cm^3 a)what is the mass of 1 cm^3 b) what is the volume of 1g of tin c) what is the density of the tin d) what is the mass of 34cm^3 of the same type of tin e) what is the volume of 130g of the s..
A 5cm radius sphere is filled with a uniform volume charge with charge density 2.3\times10-6C/m3, Calculate the electric flux out of the surface of the cube
A small package rests on the horizontal dashboard of a car. If ?s = 0.340, what is the minimum acceleration of the car that will cause the package to slip off
An elevator weighing 2500 N ascends at a constant speed of 8.0 m/s. How much power must the motor supply to do this?
A source delivers an AC voltage of the form ?v = 96.2 sin (66?t), obtain the frequency of the source
A fire in an enclosure has reached flashover, & the gas temperature is assumed to be uniform at 1000oC. The enclosure has an opening 3 m wide & 2 m high. Find the position of the neutral layer, measured from the bottom of the opening.
A 40.0 ball of clay traveling east at 5.00 collides and sticks together with a 40.0 ball of clay traveling north at 3.00. What is the speed of the resulting ball of clay
A curve of radius 152 m is banked at an angle of 11°. An 722-kg car negotiates the curve at 86 km/h without skidding. avoid the effects of air drag and rolling friction.
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