two objects attract each other gravitationally with a force of 2.1×10−10 n when they are 0.50 m apart. their total mass is 4.8 kg .

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.

Blank is the perceived frequency of a sound wave

Why does a smaller car get better gas mileage than a bigger one?