Which of the following has the largest kinetic energy? a. a 10kg dog running down the street at 30mph b. a tightrope walker slowly crossing niagara falls c. a 0.02kg bullet moving down the barrel at 800mph d. a semi truck parked in a parking lot

What are atoms of the same element with varying number of neutrons

How is zig zagging a form of acceleration?

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".