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a copper wire and an aluminum wire of the same length have the same resistance what is the ratio of the diameter of the
sound from the siren of an emergency vehicle has a frequency of 7500 hz and moves with a velocity of 3430 ms what is
when a mercury manometer is connected to a gas main the mercury stands 489 cm higher in the tube that is open to the
a hydraulic lift is lifting a car that weighs 13 kn the area of the piston supporting the car is a the area of the
if we drop a small metal sphere into the water and watch its motion it will quickly reach terminal velocity if that
an ideal gas undergoes isothermal compression from an initial volume of 537 m3 to a final volume of 227 m3 there is 645
an ideal refrigerator does 160 j of work to remove 570 j of heat from its cold compartment during each cyclewhat is the
a 984-kg satellite orbits the earth at a constant altitude of 106-kma how much energy must be added to the system to
a uniform circular disk has radius 35 cm and mass 350 g and its center is at the origin then a circular hole of radius
an electric fan is running on high after fan has been running of 132 minutes the low button is pushed the fan slows
a 30 g steel ball bounces elastically on a steel plate always returning to the same maximum height h 142 mwhat is the
an l-r-c circuit operating at 60 hz has an inductor with an inductance of 153x10-3 h a capacitance of 167x10-2 f and
two identical particles move under the influence of a central force for which the potential energy function is vr k r
a circular saw blade 0180m in diameter starts from rest in 500s it reaches an angular velocity of 120 rads with
a projectile is right at the edge of a 85 meter tall building it is then fired with an initial speed of 25ms at an
a small rock with mass 012 is fastened to a massless string with length 080 to form a pendulum the pendulum is swinging
a fly wheel turns through 30 rev1 rev2pie rad as its slows from an angular speed of 6 rads to a stopa assuming a
a size-5 soccer ball of diameter 226cm and mass 426g rolls up a hill without slipping reaching a maximum height of 500
an electron with mass 911times10-31 kg moves with a speed of 200times106 ms in a circle of 283 cm radius under the
a baseball is thrown from the roof of 211 m-tall building with an initial velocity of magnitude 116 ms and directed at
in one day a 75 kg mountain climber ascends from the 1400 m level on a vertical cliff to the top at 2380 m the next
an average emf of 32 v is induced in a circuit in which the current drops from 10 to 2 a in 01 s what is the inductance
a rifle with a weight of 40 n fires a 45-g bullet with a speed of 230 msa find the recoil speed of the rifleb if a
a railroad car of mass 25 104 kg moving at 350 ms collides and couples with two coupled railroad cars each of the same
calculate the voltage of an equipotential line between the plates of a capacitor if the distance of the line to the