A 5-kg cart moving to the right witha speed of 6 m/s collideswitha concrete wall and rebounds with a speed of 2 m/s. Is thechange in momentum of the cart (a) 0,
(b) 40 kg * m/s,
(c) -40kg*m/s,
(d) -30 kg*m/s,
(e) -10 kg*m/s

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up

radiation

explanation:

heat is transmitted by radiation

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.

snell's law

refractve index = sin incidence / sin refraction