Author Question: A 50-kg box is being pushed along a horizontal surface. The coefficient of static friction between ... (Read 56 times)

tatyanajohnson · **on:** Jul 29, 2018

A 50-kg box is being pushed along a horizontal surface. The coefficient of static friction between the box and the ground is 0.65, and the coefficient of kinetic friction is 0.35.

What horizontal force must be exerted on the box for it to accelerate at 1.2 m/s2?
A) 230 N B) 60 N C) 120 N D) 170 N E) 490 N

Question 2

The average molecular kinetic energy of a gas can be determined by knowing

A) only the number of molecules in the gas.
B) only the volume of the gas.
C) only the pressure of the gas.
D) only the temperature of the gas.
E) All of the above quantities must be known to determine the average molecular kinetic energy.