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a magnifying glass can be utilized to focus sunlight to a single point describe physically and mathematically how this
an airplane in level flight at an altitude h and a uniform speed v passes directly over a radar tracking station a
sodium atoms moving at 1000 ms are incident on a slit having a width of 100 nm at 3 m from the slit what is the
the beat detected on a moving platforma speaker fixed to a moving platform moves toward a wall emitting a steady sound
a ray of light incident upon a mirror creates an angle of 360deg with the mirror what is the angle among the incident
a block of unknown material is submerged in water light in the water is incident on the block at an angle of 31deg the
1 what is the acceleration of a bicycle that starts from rest and reaches 60ms after 50 seconds2 a horse accelerates at
a circular lake 10 km in diameter is 10 m deep see the figure figure 1 solar energy is incident on the lake at an
a typical human body has surface area 14 m2 and skin temperature 33 c if the bodys emissivity is about 095 whats the
electromagnetic waves can be shielded with a perfect conductor what about gravitational fields or
a screen is placed among two lamps so that they illuminate the screen equally the first lamp emits a luminous flux of
modern lasers can create a pulse of light that lasts only a few fem to seconds1 what is the length of a pulse of violet
local noon at 0o longitude corresponds to 1200utc a given that our longitude is 84o 28 33 w what is our local noontime
a composite pulse or pulse sandwich is an older method utilized to correct pulse imperfections due to not setting
suppose the following simplified dependence of the pressure in a ventricle of the human heart as a function of the
a simple harmonic oscillator placed in a resisting medium consists of a 100-g mass attached to a spring whose force
the lowest note on an organ is 164 hz1 what would be the pitch if the same organ pipe were closed2 what is the shortest
a rifle is fired in a valley with parallel vertical walls the echo from one wall is heard 20 s after the rifle was
what is the maximum weight that a balloon full with 100 m3 of helium can lift in air suppose that the density of air is
the concorde travelled 8000 km among two places in north america and europe at an average speed of 375 ms what is the
free electrons in two dimensions consider free electrons confined to move in two rather than in three dimensionscompute
astronomers discover an earth-like explained orbiting a star 20 light years away a how fast should a rocket ship go if
the concorde travelled 8000 km between two places in europe and north america at an average speed of 375 ms what is the
a sound wave of velocity 330 ms and wavelength 070 m is produced for 050 s1 what is the frequency of the wave2 how many