What can we say about the rock as it falls to earth? a) it accelerates as it falls. b) it falls at a constant rate of speed. c) it is at a constant velocity as it falls. d) it accelerates until it reaches a peak velocity, then decelerates.

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

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.

Which of these metals are magnetic?