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A 50Ω resistor is placed in series with a 40mH inductor. At what frequency will the current in such a circuit lag the applied voltage by exactly 45 deg.?
A Jetliner with an airspeed of 1000km/h sets out on a 1500-km flight due south. To maintain a southward direction, however, the plane must be pointed 15 degrees west of south. If the flight takes 100 min, what is the wind velocity ?
An intially uncharged 4.59-uF capacitor and a 6.63-kOHm resistor are connected in series to a 1.50-V battery that has negligible internal resistance. Calculate the circuit's time constant in milliseconds
A dentist's mirror is placed 3.1 cm from a tooth. The enlarged image is located 6.3 cm behind the mirror. How is the image oriented relative to the object
You have a ball on a wire that is twirled in a circular orbit with a radius of 3.8 m, and the centripetal force acting on the ball, What is the speed of the ball in orbit
During the investigation of traffic accident police find skid marks90metres long and the final velocity to be zero. Estimate the speedof the car when the brakes were applied
The work function of an element is 2.2 eV. Photons of a certain energy are found to eject electrons with a kinetic energy of 3 eV. What is the speed of the ejected electrons
A small block with a mass .120 kg is attached to a cordpassing through a hole in a frictionless, horizontal surface, What is the tension in the cord in the original situation when the block has speed v = .70m/s
What is the lowest frequency for standing waves on a wire that is 11.5 m long, has a mass of 120.0 g, and is stretched under a tension of 185.0 N
When resting, a person has a metabolic rate of about 6.16 x 105 joules per hour. The person is submerged neck-deep into a tub containing 2.51 x 103 kg of water at 24.3 °C. If the heat from the person goes only into the water, find the water temper..
To save on heating costs, the owner of a green house keeps 680 kg of water around in barrels. What is the minimum ampere rating of an electric heating system (240 V) that would provide the same heating effect as the water does
An electron drops from the 8 to the 6 level of an infinite square well 1.5 nm wide. Find the wavelength of the photon emitted
a horizontal 30-cm-long conducting rod is rolling along two conducting rails that are parallel to the x-axis. the rod
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