How are moving pulleys different from fixed-position pulleys?

Answer: fn = wcos50 = 38.89(9.81)(cos50) = 245.23 n

The answer is b hope this

Aform of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space. there are many forms of  electromagnetic  energy including gamma rays, x rays, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.

The correct answer is  "c".  it is "c" because melting is an endothermic change, and endothermic get's energy from surroundings.