Ablock and tackle is used to raise a 72.0 n crate 12.3 m from the loading dock to the ship. this requires a force of 25.0 n to be applied by the longshoreman. (a) what is the mechanical advantage of the block and tackle? (b) how much rope must be pulled? note: assume that ima = ma. (c) the longshoremen have only a 40 m rope that they are told not to cut. they use this for the block and tackle. how does this affect the efficiency of the block and tackle

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

Infrared rays have a shorter wavelength than question 11 options: x-rays. ultraviolet rays. radio waves. gamma rays.

Your science teacher brings in a speaker to talk to your class about climate change. during the session, students ask a few questions. which questions are related to the current evidence on climate change