Earth's circumference is about 40,000 km, and its shape is a. an oval.
c. a perfect sphere.
b. an oblate spheroid.
d. a perfect circle.

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

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?