Which international organization has people all over the world bring emergency relief to victims of war and natural disaster?
a. south korea
b. cuba
c. red cross
d. north atlantic treaty organization nato

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. if the trebuchet launches the stones with a velocity of at an angle of 50.0°, (a) how long does it take the stone to hit the ground? (b) what is the maximum distance that the trebuchet can be from the castle wall to be in range? (c) how high will the stones go? show all your work.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.