When a machine does work, a trade-off occurs. Which of the following best exemplifies this trade-off? A. A pulley changes the direction of your force, but requires a greater input force.

B. A lever increases output force and the distance the load moves.

C. A wheel and axle increases output force and the distance the load moves.

D. A ramp allows you to decrease force, but requires a greater distance.

A

A pulley changes the direction of your force, but requires a greater input force.

Explanation:

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6