A rock of mass m is thrown horizontally off a building from a height h as shown above. The speed of the rock as it leaves the thrower's hand at the edge of the building is vo
How much time does it take the rock to travel from the edge of the building to the ground?

c)as speed changes, wavelength and frequency change.

everything changes!

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.

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.