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The maximum torque experienced by a coil in a 0.65 T magnetic field is 8.4 10-4 N · m. The coil is circular and consists of only one turn. The current in the coil is 3.3 A. What is the length of the wire from which the coil is made?
A copper rod 20 cm long having a cross-sectional area of 7.0 cm2 is used to connect a boiler maintained at 100 oC to a large block of ice at 0 oC. What is the rate of change in entropy of the boiler
A dentist's drill starts from rest. After 2.90 s of constant angular acceleration it turns at a rate of 2.2 104 rev/min. Find the drill's angular acceleration
Red light travels at 2.07×108 m/s in a particular type of oil. What is the index of refraction for red light in the oil
The three charged particles in the figure below are at the vertices of an isosceles triangle (where d = 3.80 cm). calculate the electric potential at point A, the midpoint of the base
Four identical metallic objects carry the following charges: +8.2 µC, +7.0 µC, -2.6 µC, and -9.2 µC. What is the final charge on each object
A freight company uses a compressed spring to shoot 1.7 kg packages up a 1m high frictionless ramp into a truck. The spring constant is 241 N/m and the spring is compressed 33 cm.
In the circuit shown, the AC voltage source supplies an rms voltage of 157 V at frequency f. The circuit has R = 96 %u03A9, XL = 215 %u03A9, and XC =99 %u03A9. Find the rms current flowing in the circuit
In order to study the long-term effects of weightlessness, astronauts in space must be weighed (or at least "massed"). Find the mass of the astronaut
Two charges q = +8.0 µC are fixed a distance d = 9.0 cm apart. You bring a third charge q = +8.0 µC from infinity to C. How much work must you do
A parallel-plate capacitor with circular plates of radius R is being charged. The change of electric field is given by dE/dt=1.5E12 V/(mS). The field magnitude B for r=5R is 1E-7 T.
The rotor in a certain electric motor is a flat, rectangular coil with 84 turns of wire and dimensions 2.45 cm by 4.04 cm. The rotor rotates in a uniform magnetic field of 0.800 T. Find the peak power output of the motor
A 2500 kg car rounds a flat curve of radius 75 m at speed of 80 km/h. if the pavement is icy and the force of static friction is 6000 n, what is the maximum speed the car could safely go around the curve
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