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.

Can someone explain to me how to do this problem ?

A23 kg log of wood begins from rest, 300 m up a sluice (a water track used to transport logs, think of it as an inclined plane with negligible friction) inclined at 20° to the horizontal. after it reaches the flat waterway at the bottom it collides elastically with a 100 kg block of wood initially at rest near the base of the incline. (a) how long does it take the 23 kg log to travel down the incline? (b) what is the speed of the 23 kg log at the bottom of the incline? (c) what are the velocities of both blocks of wood after the collision? (d) what is the total kinetic energy before the collision? (e) what is the kinetic energy of the 23 kg log after the collision? (f) what is the kinetic energy of the 100 kg block of wood after the collision? (g) what is the total kinetic energy after the collision? (h) compare the total initial and total final kinetic energies. is this consistent with what you would expect for elastic collisions? explain!

If the textbook weighs 19.6 newtons on venus, what is the strength of gravity on venus?