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the intensity of an electromagnetic wave is 8 times 107 wm2 what is the amplitude of the magnetic field of this
an ac generator has 80 rectangular loops on its armature each loop is 12 cm long and 8 cm wide the armature rotates at
a 120-v rms voltage at 1000 hz is applied to a series lrc circuit with an equal value of inductive and capacitive
larger animals have sturdier bones than smaller animals a mouses skeleton is only a few percent of its body weight
what is the smallest diameter spot the eye can produce on the retina if the pupil diameter is 450mm assume light with
a farsighted person uses glasses with a refractive power of 33 diopters the glasses are worn 27cm from his eyeswhat is
a convex lens with f1 199 is mounted 400cm to the left of a concave lens when an object is placed 308cm to the left of
a meterstick of negligible mass has a 025 kg mass at its 31 cm mark and a 040 kg mass at the 77 cm mark where should
you are standing 19m from a 130w- lightbulba if the pupil of your eye is a circle 50mm in diameter how much energy
an electric trimmer blade has rotational inertia 185times10-4 kgm2a what torque is needed to accelerate this blade from
a 115 m long ramp is inclined at 19 degrees to the horizontal a solid ball is released from rest at the top of the
the star sirius is a distance of 8 light-years from the earth if sirius suddenly stopped shining how much longer would
a revolving door consists of four rectangular glass slabswith the long end of each attached to a pole that acts as the
a charged capacitor is connected to an inductor to form an lc circuit with a frequency of oscillation f 16 hz at time
an object of mass 68 kg is attached to a spring of force constant 1830 nm the object is set into simple harmonic
a child on a swing-set swings back and forth if the length of the supporting cables for the swing is 28 m what is the
a speedy tortoise can run with a velocity of 10 cms and a hare can run 20 times as fast in a race they both start at
a car originally traveling at 30 ms manages to brake for 5 seconds while traveling 125 m down hill at that point the
starting from rest a car travels 1350 m in 1 minute it accelerated at 1 ms2 untill it reached its cruising speed then
the electric field strength just outside the outer conductor of a coaxial cable of outer radius of 02cm is e7200nc
one particle has a mass of 400 10-3 kg and a charge of 9 microc a second particle has a mass of 700 10-3 kg and the
a mass of 032 kg attached to a spring with a spring constant of 730 nm is set into simple harmonic motionwhat is the
a ray of light strikes a thick sheet of glass n 15 at an angle of 25 degrees with the normal find the angle of the
the image of a tree on a 35 mm color slide is 14 mm high it is to be projected onto a screen 6 m from the slide and is
listen to whales songs and explain the effects of sound waves in the air and water by bringing examples with formulae