2.1 Give the correct term for the following description:
A single vector having the same effect as two or more vectors together
(1)​

Which statement best explains why an object weight less on mercury than it does on earth

Aphysical change is a change in the size, shape,, or stafe of matter true or false

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.