Transverse wave Longitudinal wave
Sound
Ocean wave
Can be reflected
Infrared light
Requires a medium
Speed dependent upon the medium they
are traveling through
Transfers energy
Visible light

Which ones are electromagnetic, mechanical or both?

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

What are the necessary conditions for fusion?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".