The table lists information about four devices.
device
wire loops
60
w
current (ma)
0.0
0.2
0.1
40
metal core
yes
yes
no
no
y
30
0.1
which lists the devices in order from greatest magnetic field strength to weakest?
w, x, y, z
w. z, y, x
x, z, y, w
x, y, z, w
save and et
shim

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

Where do magnetic lines of force enter earth?

Convection currents are caused by differences in what two things?