A straight 3.00 mm wire carries a typical household current of 1.50 A (in one direction) at a location where the earth's magnetic field is 0.550 gaussgauss from south to north. Find the magnitude and direction of the force that our planet’s magnetic field exerts on this wire if it is oriented so that the current in it is running.

a. from west to east,
b. vertically upward,
c. from north to south.
d. Is the magnetic force ever large enough to cause significant effects under normal household conditions?

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!

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

Which of the following are guidelines to follow for obtaining accurate observations