In Federalist 78 Hamilton writes this about the judiciary: "It may truly be said to have neither FORCE nor WILL but merely judgment; and must ultimately depend on the aid of the executive arm even for the efficacy of its judgments."
a. What does this mean?

The Judiciary cannot physically enforce a law without the Executive and Legislative

Explanation:

Alexander Hamilton's essay Federalist 78 justifies the structure of Judiciary along with its shortcomings.  

Federalist No. 78 views the inability of judicial branch as an inherent weakness. It can neither control the money or military.

He says Judiciary has "no influence over either the sword or the purse". Judicial branch has the power of judgment which is driven by Executive and Legislative. It never functions independently without the aid of Executive. He says that Federal judiciary has the power to determine constitutional validity but cannot enforce it in isolation  

The correct answer to this open question is the following.

The point about change that Martin Luther King, Jr. was making by telling the story of "Rip van Winkle" was the invitation to the African American community to "wake up" of the slumber they were in and start to manifest in the streets and to participate in the activist's civil rights actions to the demand equal rights..

The story of "Rip van Winkle" was written by Washington Irving in 1819. It refers to a man in colonial times called Rip van Winkle who slept for 20 years and when he wakes up, everything had changed. He didn't know that the colonies were independent by winning the Revolutionary War.