Answer:
going to work my way down
Troposphere
contains weather
contains life forms
stratosphere
contains ozone layer
mesosphere
where asteroids burn up
very low temps
thermosphere
widely varying temps
exosphere
almost no molecules
Explanation:
Answer:

Explanation:
First, we write the equations of motion for each axis. Since the crate is sliding with constant speed, its acceleration is zero. Then, we have:

Where T is the tension in the rope, F is the force exerted by the first worker, f_k is the frictional force, N is the normal force and mg is the weight of the crate.
Since
and
, we can rewrite the first equation as:

Now, we solve for
and calculate it:

This means that the crate's coefficient of kinetic friction on the floor is 0.18.
Explanation:
power=f×v. recall= distances/ time
= f× d/t
= 30 × 2/5
=12watt
Place the boxes 10cm apart, if they are closer that concentrates the mass of the boxes more