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in a certain time light travels 488 km in a vacuum during the same time light travels only 319 km in a liquid what is
a sailboat is heading directly north at a speed of 18 knots 1 knot 0514 ms the wind is blowing towards the east with a
a half-wave antenna works on the principle that the optimum length of the antenna is half the wavelength of the
the wheels axle and handles of a wheelbarrow weigh w 59 n the load chamber and its contents weigh wl 691 n the
two particles each have a mass of 580 10-3 kg one has a charge of 50 10-6 c and the other has a charge of -50 10-6 c
the drive propeller of a ship starts from rest and accelerates at 244 x 10-3 rads2 for 243 x 103 s for the next 119 x
a uniform electric field exists in a region between two oppositely charged plates an electron is released from rest at
the apparent weight of passengers on a roller coaster increases by 52 as the car goes through a dip with a 35 radius of
a proton and an electron form two corners of an equilateral triangle of side length 19 x 10-6 m what is the magnitude
a highway curve of radius 420 is designed for traffic moving at a speed of 100 what is the correct banking angle of the
a ball throw horizontally from the top of a building at 153 ms hits the ground 533 meters from the edge of a building
communications satellites are placed in a circular orbit where they stay directly over a fixed point on the equator as
the partial pressure of oxygen in air is about 020 atm air is 20 oxygen by volume in deep-sea diving the composition of
an electric field with an average magnitude of about 220 nc points downward in the atmosphere near earths surface we
a ball is launched from the top edge of a building 328 m high at a speed of 237 ms at an angle of 150 degrees above the
two parallel square metal plates side length 13 cm are separated by a dielectric material with a dielectric constant 39
a uniform string of length is 25 m and mass 001 kg is placed under a tension 10na what is the frequency of its
some bacteria are propelled by biological motors that spin hair-like flagella a typical bacterial motor turning at a
one rechargeable battery of mass 150 g delivers an average current of 180 ma to a compact disc player at 160 v for 240
suppose you measure a cylinder and determine that the radius is 052 001 cm and its height is 320 015 cmwhat is the
the heating element of an electric coffee maker operates at 120 v and carries a current of 200 a assuming the water
consider an electron in the ground state of the hydrogen atom separated from the proton by a distance of 00529 nma
how many conduction electrons are there in a 500 diameter gold wire that is 400 long how far must the sea of electrons
a mass-spring system completes 7 full oscillations in a time of 144 seconds1 what is the period of one oscillation2
a proton enters the gap between a pair of metal plates an electrostatic separator that produces a uniform vertical