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a battery has an internal resistance of 074 a number of identical light bulbs each with a resistance of 27380 are
the average power used by a stereo speaker is 56 w assuming that the speaker can be treated as a 77- resistance find
the heating element of a clothes dryer has a resistance of 162 a voltage of 240 v is connected across the heating
an electric vehicle starts from rest and accelerates at a rate of 18 ms2 in a straight line until it reaches a speed of
a uniform electric field of magnitude 430 nc pointing in the positive x-direction acts on an electron which is
kenny throws a basketball which has an initial speed v0 when the ball gets to its minimum speed sometime before
a girl kicks a ball from ground level the initial velocity of the ball has an x-component of 17 ms and a y-component of
if 7 v is applied to the above circuit and the voltage across the first lamp is 1 v what is the voltage across the
in a circuit of two lamps in series if the current through one lamp is 2 a what is the current through the other
a fan at a rock concert is 500rm m from the stage and at this point the sound intensity level is 109rm db sound is
a fireman d 600 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of
a playground is on the flat roof of a city school 61 m above the street below see figure the vertical wall of the
a car is parked on a cliff overlooking the ocean on an incline that makes an angle of 170deg below the horizontal the
a model rocket is fired vertically from rest it has a net acceleration of 175 ms2 after 15 s its fuel is exhausted and
in getting ready to slam-dunk the ball a basketball player starts from rest and sprints to a speed of 66 ms in 291 s
a tiny ball of mass 0425 g is suspended by a thread of negligible mass in a horizontal electric field of 400 nc if the
a hot-air balloon is ascending at the rate of 10 ms and is 97 m above the ground when a package is dropped over the
a particle moves horizontally in uniform circular motion over a horizontal xy plane at one instant it moves through the
when you drop a rock into a well you hear the splash 10 seconds latera how deep is the wellmb if the depth of the well
a person with perfect pitch sits on a bus bench listening to the 451 hz horn of an approaching car if the person
a bat moving with a speed of 325 ms and emitting sound of 360 khz approaches a moth at rest on a tree trunka what
a particle leaves the origin with an initial velocity v24msx and moves with constant acceleration a-190 ms2x 320ms2y
to stop a car first you require a certain reaction time to begin braking then the car slows under the constant braking
starting from a rest a car accelerates at 23 ms2 up a hill that is inclined 59 degrees above the horizontal how far
two point charges 50 microc and 20 microc are separated by 40 m what is the electric potential