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astronomers measure the width of the spectral lines of a star to be much wider than would be measured in a laboratory
the coefficient of friction between a block of mass m1 3kg and the surface is mu4 the system starts from rest what is
with a quick flick of her wrist an ultimate frisbee player can give a frisbee an angular velocity of 500 revolutions
two gerbils run in place with a linear speed of 055 on an exercise wheel that is shaped like a hoop find the angular
i have a rectangular wire loop that lies in the xy-plane the left edge of the loop is on the y-axisthe x-dimension of
if the person in the figure lowers his forearm with mass 12kg to be 15 degrees below horizontal how much force must the
a 420ndashkg block is set into motion up an inclined plane with an initial speed of vi 740 ms see figure below the
a boy pulls his brother on a sled horizontally across all snow-covered field the coefficient of friction between the
a crate of mass 94 kg is pulled up a rough incline with an initial speed of 146 ms the pulling force is 94 n parallel
the human eye can detect light intensities as small as about 3 10-23 wm2a what is the corresponding electric field
when viewed by an observer on the earth light from a distant galaxy is doppler shifted to the red such that the ratio
estimate the doppler shift for a radio wave reflected from an airplane moving directly toward you at a speed of 298 ms
after an eye examination you put some eyedrops on your sensitive eyes the cornea the front part of the eye has an index
a highway curve with radius 950rm ft is to be banked so that a car traveling 480rm mph will not skid sideways even in
a hydrogen atom initially at rest emits an ultraviolet photon with a wavelength of 121 what is the recoil speed of the
an artillery shell of mass 1000 kg lying at rest on the ground accidentally detonates exploding into three pieces of
a what is the escape speed on a spherical asteroid whose radius is 804 km and whose gravitational acceleration at the
a magician wishes to create the illusion of a 217-m-tall elephant he plans to do this by forming a virtual image of a
a certain satellite travels in an approximately circular orbit of radius 24 times 106 m with a period of 5 h 31 min
a find the electric and magnetic field amplitudes in an electromagnetic wave that has an average energy density of 27
you fly your not-so-trusty scooty puff pro spaceship away from the earth along a line that con- nects the center of the
a racetrack is to have a banked curve with radius 225 m what should be the angle of the bank if the normal force alone
qualitatively speaking what is the difference between flux and intensity measurements what are the units of each in
monochromatic x rays are incident on a crystal for which the spacing of the atomic planes is 0442 the first-order