Please help me In pulley system A, the end of the rope must be pulled 10 cm downward in order to raise the weight 10 cm upward. In pulley system B, the end of the rope must be pulled 20 cm downward in order to raise the weight 10 cm upward.

What is the mechanical advantage for each pulley system?
A.
AB
12

B.
AB
2010

C.
AB
21

D.
AB
1020

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.