A force of (200 N) is applied across a (30 Kg) box, calculate the friction force and the vertical force at (a= 2 m/s2). If the force inclined by 60 degree from the horizontal plane (no move in y axis) *

1.) Frictional force = 40N

2.) Vertical force = 294 N

Explanation:

Given that a force of (200 N) is applied across a (30 Kg) box, calculate the friction force and the vertical force at (a= 2 m/s2). If the force inclined by 60 degree from the horizontal plane 

The given parameters are:

Force F = 200 N

Mass M = 30 kg

Acceleration a = 2 m/s^2

Angle Ø = 60 degree

For the object to move horizontally, the force applied must overcome the frictional force.

But force F = product of mass and acceleration

That is,

FcosØ - fr = ma

Where fr = frictional force.

Substitute all the parameters into the formula

200 cos 60 - fr = 30 × 2

100 - fr = 60

-fr = 60 - 100

Fr = 40 N

Therefore, the frictional force is equal to 40N

The vertical force ( normal force) will be equal to the weight of the body

Weight = mg

Weight = 30 × 9.8

Weight = 294 N

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.