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in the model of hydrogen atom created by niels bohr the electron moves around the lone proton in the nucleus at a speed
1 a 0075 kg arrow is fired horizontally the bow string exerts an average force of 65n on the arrow over a distance of
a ball is thrown forward horizontally from the top of a cliff with a velocity of 10 ms the height of the cliff is 45
car c of mass 30 x 103 kilogram is traveling at 50 ms it approaches car d of mass 20 x 103 kilogram going 30 ms in the
a uniform upward-pointing electric field e of magnitude 400times103nc has been set up among two horizontal plates with
determine at what angle should the roadway on a curve with a radius 50 meter be banked to allow cars to negotiate the
a ball is thrown horizontally from the top of a house 35 meter high the ball strikes the ground 100 meter from the base
a spider hangs from a strand of silk whose radius is 190010-6 m the density of the silk is 1300kgm3 when the spider
a solid sphere of mass 10 kilogram and radius 0010 meter starts from rest and rolls without slipping down a 10 meter
a simple pendulum is made from a 076-m-long string and a small ball attached to its free end the ball is pulled to one
a 100-w incandescent light bulb has a cylindrical tungsten filament 250 cm long 0440 mm in diameter and by an
a wheel of moment of inertia of 500 kgbullm2 starts from rest and accelerates under a fix torque of 300 nbullm for 800
a meter stick lies at the bottom of a 100cm long tank by its zero mark against the left edge you look into a tank at 30
a rotating flywheel can be used to store energy if it is required to store 100 x 106 joule of energy when rotating at
a boy wishes to row across a river in the shortest possible time he can row at 2 ms in still water and the river is
unpolarized light of intensity i0 is incident on the following arrangements of polarizing sheets the first polarizer is
at timenbspt 0 a grinding wheel has an angular velocity of 230nbsprads it has a constant angular acceleration of
a narrow slit 0072 mm wide is illuminated with monochromatic light and a diffraction pattern is observed on a screen 40
an electron has a speed of 06 ca discover the speed of a proton that has the same kinetic energy as the electronb
what are the advantages and disadvantages of constructive and deconstructive interferences give typical examples of
a 700 kilogram guy stands at one end of a 1000 kilogram raft that is 50 meter long the other end of the raft is 10
a 450 kilogram lady is standing on a 160 kilogram plank the plank originally at rest is free to slide on a frozen lake
a tuning fork with a frequency of 440 hz is held above a resonance tube that is partially full with water assuming that
a person with mass 700 kilogram jumps out of a window from a fire in his building into the firefighters net below the
a 020 kilogram ball is thrown straight up into the air with an initial speed of 13 ms determine the momentum of the