A girl of mass 48kg is rescued from a building fire by leaping into a firefighters' net. The window from which she leapt was 12 metres above the net. She lands in the net so that she is brought to a stop in 0.45 seconds. During this interval, a) What is her change in momentum?
b) What is the impulse on the net due to girl?
c) What is the average force on the net due to girl?

What property of an object determines its inertia?

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?