A 500 g box is pulled by a force over a horizontal surface. The coemelent of kinetie trietien between the surface and the box is 0.31; pulling force has a magnitude of 채 N and is parallel to the surface. What is the magnitude of the friction foree acting on the boxt
a. 0.16 N
b. 1,5 N
c. 1.7 N
d. 4.6N
e. N 67.
What is the acceleration of the box?
a. 0.16 m/s
b. 1.5 m/s
c. 1.7 m/s
d. 4.6 m/gt
e. 3.8 m/g

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

Agas initially at p1 = 1 bar and occupying a volume of 0.5 liter is compressed within a piston–cylinder assembly to a final pressure p2 = 4 bar. (a) if the relationship between pressure and volume during the compression is pv = constant, determine the volume, in liters, at a pressure of 3 bar. (b) repeat for a linear pressure–volume relationship between the same end states. reference

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !