Starting from rest, a 5.0 kg block slides 2.4 m down a rough 30.0
◦
incline in 2.0 s.
The acceleration of gravity is 9.81 m/s
2
.
Find the change in mechanical energy due to
friction.
Answer in units of J.

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

What is created when solids,liquids,an gases mix with one another

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.