In the picture below, iron filings and a permanent magnet were placed on a flat surface. What is indicated by the shape of the filings around the magnet?

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.