1.What is the true density of water? 2.What variables change the density of water? 3. How does water go against the concept of "Thermal Expansion"? Use full sentences that awnser the question? The response should be Fu no copying from internet

If the speed of a particle triples ,by what factor does its kinetic energy increase?

How is the gravitational force related to the distance between two objects?

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".