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1 consider a spring handing vertically from a ceiling attached to a mass m of 2 kg the spring constant k is 30 nm the
1 on a horizontal frictionless surface a block of mass m is sliding along on constant velocity v a block of mass m
a researcher would like to perform an experiment in a zero magnetic field which means that the field of the earth must
two carts of equal mass m 0280 kg are placed on a frictionless track that has a light spring of force constant k 476
an 866g bullet is fired into a 260g block that is initially at rest at the edge of a table of h 107 m height see the
during each cycle a refrigerator ejects 605 kj of energy to a high-temperature reservoir and takes in 545 kj of energy
a heat pump has a coefficient of performance of 370 and operates with a power consumption of 715 103 wa how much energy
a freezer has a coefficient of performance of 630 it is advertised as using 446 kwhyr note one kilowatt-hour kwh is an
a heat pump has a coefficient of performance equal to 435 and requires a power of 177 kw to operatea how much energy
a heat engine operates between a reservoir at 26degc and one at 324degc what is the maximum efficiency possible for
a styrofoam cup holding 155 g of hot water at 97degc cools to room temperature 230degc what is the change in entropy of
a 550-mol sample of h2 gas is contained in the left side of the container shown below which has equal volumes on the
a 916-kg astronaut and a 1180-kg satellite are at rest relative to the space shuttle the astronaut pushes on the
three uniform meter sticks each of mass are placed on the floor as follows stick 1 lies along the axis from 0290 m to
a series ac circuit contains a 159 resistor a 360 mh inductor a 24 microf capacitor and a generator with maximum
an ideal transformer shown in the gure below has a primary with 45 turns and secondary with 18 turns the load resistor
a 0275 kg puck initially at rest on a frictionless horizontal surface is struck by a 0220 kg puck that is initially
a what is the rms current in an rc circuit if r 520 k c 150 uf and the rms applied voltage is 120 v at 600 hzb what is
suppose you are stopped for a traffic light and a ambulance approaches you from behind with a speed of 18 ms the given
an object fired at an angle of 39 degrees above horizontal takes 110 s to travel the last 125 m of its vertical
a rescue helicopter lifts a 79-kg person straight up by means of a cable the person has an upward acceleration of
a recording engineer works in a soundproof room that is 440 db quieter than the outside if the sound intensity in the
a golf ball strikes a hard smooth floor at an angle of 324deg and rebounds at the same angle the mass of the ball is
in an l-r-c series circuit the rms voltage across the resistor is 284 v across the capacitor it is 914 v and across the
a 308 kg block starts from rest at the top of a 30deg incline and accelerates uniformly down the incline moving 213 m