Estimate the power you produce in running up a flight of stairs. give your answer in horsepower (1 hp = 746 w). suppose you climb one flight of stairs (3 m) in 10 seconds (you run up the stairs quickly). estimate your mass to be 81 kg .

Two polarizers are oriented at 24.0∘ to one another. light polarized at a 12.0-degree angle to each polarizer passes through both. what is the transmitted intensity (%)?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".

According to the image below, which season is about to begin in the southern hemisphere? a. summer b. autumn c. winter d. spring