An object of mass 20kg is released from a height of 10 meters above the ground level. The kinetic energy of the the object just before it hits the ground is _show that if a force applied at an angle ∅ with the horizontal direction, work done = FcosØ​

A-4.60 μc charge is moving at a constant speed of 6.80×105 m/s in the +x−direction relative to a reference frame. at the instant when the point charge is at the origin, what is the magnetic-field vector it produces at the following points.

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked