One light-hour is the distance that light travels in an hour. how far is this, in kilometers? (recall that the speed of light is 300,000 km/s.) ) 18 million kmb) 1.08 billion kmc) 300,000 kmd) 9.46 trillion kme) 100 million km

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

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