Identify the type of friction in each situation described below: a. Two students are pushing a box that is at rest
b. The box pushed by the students is now sliding
c. The students put rollers under the box and push it forward

Aregular polygon has angkes of size 150° each.how many side has the polygon

The position of a crate sliding down a ramp is given by x=(0.05t^3) m, y=(1.7t^2) m, z=(6−0.85t^5/2) m, where t is in seconds. (a) determine the magnitude of the crate's velocity when t = 2 s. (b) determine the magnitude of the crate's acceleration when t = 2 s.

The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5. what is the specific heat ratio? show the math steps .