Assume that the North American continent can be represented by a slab of rock 6000 km on a side and 35 km deep and that the rock
has an average mass density of 2790 kg/m3
.
The continent is moving at the rate of about
1.2 cm/year.
What is the mass of the continent?

What is hidden during a lunar eclipse? isn't the moon hidden?

Consider a one meter long horizontal pipe with a constant 100 cm^2 cross sectional area. water flows rightward into the pipe at x = 0 with flow velocity 02m/sec at every point within the pipe intake area. at x=1, the rightward flow rate is 0.192 m/sec. assume the water is a conserved quantity in the pipe, so there must be a leak (a sink) somewhere in the pipe. 1. compute net volumetric flow of the source if the system to be in equilibrium. 2. now assume the pipe in the problem has no leaks. compute the net volumetric rate of change for the system.

Abar magnet cut in half will form a total ofpoles. a)fourb)eightc)two