The work done to load the box usong the simple pulley is 1,845 J. compute the force needed. considering your answer how does a simple pulley help?

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

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.

Which radioisotope is used in dating geological formations?