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Question1
A current of 1A is injected into the earth at the bottom of a borehole. Derive an expression for the Voltage at distance R from the injection point. Assume that the earth has a uniform linear conductivity and that the borehole diameter is negligible (Use J = σE).
Question2
A bicycle wheel is rotating with an angular velocity of 3.1 rev/s. The brakes coefficient of kinetic friction between the wheel and the brakes is 0.87, find out the number of revolutions the wheel makes in coming to rest. The moment of inertia of the wheel is 0.24 kg*m and its radius is 0.32 m.
Question3
Consider a crate at rest on a factory ?oor. As a pair of workmen start lifting it, does the support force on the crate provided by the ?oor increase, decrease, or remain unchanged? What happens to support force on the workmen's feet?
Sam's job at the amusement park is to slow down and bring to a stop the boats in the log ride. how much work does Sam do to stop it
Light of 546 nm wavelength is incident on a cesium surface that has a work function of 1.91 eV. find the threshold wavelength
A 3-m-long rigid beam with a mass 120 {rm kg} is supported at each end. An 70 {rm kg} student stands 2.0 {rm m} from support 1. How much upward force does support 1 exert on the beam.
How much work is done by an applied force that moves two charges of +6.8 µC that are initially very far apart to a distance of 5.3 cm apart?
A flashlight bulb with a resistance of 40 ohm is powered with a six volt battery and produces .75W power. obtain the internal resistance of the battery
a concave mirror has a focal length of 15.0 cm. An object is placed 18.5 cm in front of the mirror. How tall is the object placed in front of the mirror
A certain freely falling object, released from rest, requires 1.05 s to travel the last 33.0 m before it hits the ground. Find the total distance the object travels during the fall
A 310g bird flying along at 6.2m/s sees a 8.0g insect heading straight toward it with a speed of 31m/s, What is the bird's speed immediately after swallowing
Force F = (-5.0 N) i hat + (5.0 N) j hat acts on a particle with position vector r = (-3.0 m) j hat + (5.0 m) k hat. What is the angle between the directions of force and torque
What is a quantum well: give an example of structure, growth method to make quantum wells and quantum states i.e. outline quantization using diagrams
Consider a beam of electrons passing through a region with crossed electric and magnetic fields. What is the speed (in m/s) of the electrons
question1a step-up transformer has 270 turns on its primary coil and 90000 turns on its secondary coil. the emf of the
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