The wires leading to and from a 0.12 mm diameter lightbulb filament are 1.5 mm in diameter. The wire to the filament carries a current with a current density 4.5 X 105 A/m2. What are (a) current and the (b) current density in the filament

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.