How many calories does it take to raise the temperature of 500g of water by 3C?

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

Ineed the answer to question 1 , i’m desperate

Suppose that f : rn → rm and that a ∈ k, where k is a connected subset of rn . suppose further that for each x ∈ k there exists a δx > 0 such that f(x) = f(y) for all y ∈ bδx (x). prove that f is constant on k; that is, f(x) = f(a) for all x ∈ k