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a variable capacitor in a circuit with a 120v 60-hz source initially has a capacitance of 25uf the capacitance is then
a transmission line that has a resistance of 05 ohm per km of length is used to transmit 200 mw across 300 miles if the
you have two bar magnets in front of you for the one on the right the primary coil the farthest part is positive and
a 300-f capacitor is fully charged by a 120-v battery the two ends of this fully charged capacitor are then connected
a block is placed at the bottom of the incline and given an initial velocity v0 directed along the incline the
two 8ohm resistors are connected in parallel as are two 4 ohm resistors these two combinations are then connected in
a 50 cm long solenoid has 100 turns of wire and carries a current of 95 a it has a ferromagnetic core completely
a radiator has an emassivity of 90 and its exposed area is 123 m2 the temperature of the radiator is 100 degrees c and
a certain kind of glass has nblue 1560 for blue light and nred 1510 for red light if a beam of white light containing
a car with fuzzy dice hanging from the rear view mirror by a single string drives along at a constant 250 msa if the
consider a spider walking from the top of a stationary beach ball let that angular position 0o the spider finds it
a popular carnival ride consists of a large round room that rotates fast enough that any person standing against the
starting from rest a 670 kg object falls through some liquid and experiences a resistive drag force that is linearly
in an ac circuit that contains a resistor a capacitor and an inductor impedance replaces the dc concept of resistance
a a heat engine does 250 j of work per cycle while exhausting 700 j of heat to the cold reservoir what is the engines
a 15 ohm resistor has a voltage difference of 1 v across its leadsa what is the current through the resistorb what is
element x decays to element y with a half-life of 077 s initially there is a sample of pure x and after 231 s there are
he is a helum atom with one electron missing treating this like a hydrogen arom what is the first excited state of this
a solenoid has a cross-sectional area of 58 x 10-4 m2 consists of 330 turns per meter and carries a current of 041 a a
christy has a grandfather clock with a pendulum that is 1000 m longa if the pendulum is modeled as a simple pendulum
the maximum strain of a steel wire with youngs modulus 20 x 1011 nm2 just before breaking is 020 what is the stress at
a 24-kg boy stands 6 m from the center of a frictionless playground merry-go-round which has a moment of inertia of 240
a block of mass m 3 kg is attached to a spring k 27 nm by a rope that hangs over a pulley of mass m 7 kg and radius
a coin is located 296 cm to the left of a converging lens f 216 cm a second identical lens is placed to the right of
an ice hockey puck is sliding along the vertical wall as shown on the picture top view shown puck is moving in the