A micro-tesla is 10-6 T, and Earth's magnetic field is about 50 micro-teslas. Suppose you have a long wire carrying 10 A of current and you bring up your compass to see if it can be made to deflect by the wire. As you bring it close, at what distance from the wire might you expect to see the compass move if it is sensitive to 20% of Earth's field

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.