What is the efficiency of a block and tackle if you pull 25 m of rope with a force of 820 N to raise a 75 kg grandfather clock 15 m?

Which is not true of the intertropical convergence zone? a) it features heavy precipitation b) it's where the trade winds collidec) it's a high-pressure zone with sinking air d) it is also known as the doldrums

Awhite-blue star is hotter than a red star. select the best answer from the choices provided true or false

What was the purpose of the apollo program? to put a man in orbit to launch a spy satellite to launch a space station to put man on the moon