An object reflects all the colors of the visible spectrum. what does this tell you about the object?

a. the object is white.

b. the object is black.

c. the object is a mirror.

d. the object is a lens.

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?

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