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A copper wire has radius r = 0.0245 cm, is 3.05 m long, has resistivity ρ = 1.72 · 10−8 Ω m, and carries a current of 0.360 A. The wire has density of charge carriers of 8.50 · 10^28 electrons/m^3. (When entering units, use ohm for Ω.)(a) What is the resistance, R, of the wire?(b) What is the electric potential difference, ΔV, across the wire?(c) What is the electric field, E, in the wire? (Enter the magnitude of the electric field.)
An asteroid with a rest mass of 8.2 1011 kg is observed to have a relativistic momentum of magnitude 4.54 1020 kg · m/s
The frequency of a steam train whistle as it approaches you is 538Hz. After it passes you, its frequency is 486Hz. How fast was the train moving
A circular rod of length 25cm and diameter 8mm is made of 1045grade steel. (a) calculate the stress and strain in the rod, andits extension, when it is subjected to 5kN of tension. (b) Atwhat force would the rod begin to yield? (c) by what amount ..
A 0.2kg flying pig toy is attached to the ceiling with a string. When the pig's wings flap, find the angle the string makes with the vertical
A man enters a tall tower, needing to know its height. He notes that a long pendulum extends from the ceiling almost to the floor and that its period is 27.5 s. How tall is the tower
A step-down transformer produces a voltage of 7.0V across the secondary coil when the voltage across the primary coil is 120V. What voltage appears across the primary coil of this transformer if 120V is applied to the secondary coil?
A parachutist and her parachuting equipment have the combined mass of 121 kg. Her terminal velocity is 5.30 m/s with the parachute open. Her parachute has a cross-sectional area of 35.80 m^2. The density of air at that altitude is 1.23kg/m^3. What is..
One long wire lies along an x axis and carries a current of 42 A in the positive x direction, What is the magnitude of the resulting magnetic field at the point (0, 2.0 m, 0)
Calculate the entropy change for the following system: One kilogram of 80 C aluminum is placed into 2L of 20 C water in a container with negligible heat capacity and adiabatic walls. The water and aluminum reach thermal equilibrium. Assume specific h..
A person pushes on a stationary 125 N box with 64 N at 30 deg below the horizontal, What is the force friction on the box
A 50 kg diver has an angular velocity of 6 rad/s about her medial-lateral axis of rotation when she leaves the board in a layout position, what is her radius of gyration in the tuck positions
Vector A points in the negative y direction and has a magnitude of 3 units. Vector B has three times the magnitude and points in the positive x direction. Find out the direction and magnitude of the following vectors.
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