Scientists have studied the aerodynamic forces generated by a flying insect by tethering it to the center of a taut, horizontal wire. as the insect "flies" in a wind tunnel, the insect exerts forces on the wire that a researcher can detect by measuring the wire’s deflection. to calibrate the wire, a known force must be applied to it. this is done by passing a current through the wire while it is positioned in a magnetic field that is perpendicular to the wire. the researcher requires the force on the wire to point upward with a magnitude of 4.2x10-4 n.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. 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. a) what is the block's initial mechanical energy? 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.

Place me with this question is my last question

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2