Thanks to me, you can see straight through the wall. What am I?

Why does the input force have to be greater than the force needed to lift the bale?

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.