Boiling water was placed in containers made of four different materials. A table is provided. Water Temperature (°C)
Material
O Min
5 Min
10 Min
15 Min
1
100
87
85
81
2.
100
96
93
91
3
100
78
71
63
4
100
92
87
83
Based on the data, which material was the best insulator of heat?
Material 1
Material 2
Material 3
Material

What is friction? how does it affect the motion of an object?

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".

Which word expression describes how much to calculate pressure