The acceleration of a particle is given by a = 3t – 4, where a is in meters per second squared and t is in seconds. determine the velocity and displacement for the time t = 3.6 sec. the initial displacement at t = 0 is s0 = – 8 m, and the initial velocity is v0 = – 5 m/sec.

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

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.

Metals are good conductors of electricity because they