if the strength of a radio signal at 20 meters from its source is 80 mW, what would the signal strength be at 80 meters from the same source

coil wire, increase current, put iron inside the coil

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.