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

Ahydroelectric plant takes energy from water and turns it into electrical energy. what are the transformations of energy in the water molecules that are used in the process of generating electricity this way?

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)