The mass of a stroller and the child it carries is 21.1 kg. a woman pushes the stroller with a force of 121 n at an angle of 41.0° to the vertical. the stroller experiences a friction force of 4.0 n. what is the stroller's acceleration forward?

Explanation:

Newton's second law:

∑F = m*a Formula (1)

∑F : algebraic sum of the forces in Newton (N)

m : mass s (kg)

a : acceleration  (m/s²)

We define the x-axis in the direction parallel to the movement of the stroller   and the y-axis in the direction perpendicular to it.

Forces acting on the  stroller

W: Weight of the stroller and the child : In y-direction  downward

FN : Normal force : In y-direction  upward

f  = 4 N: Friction force: In x-direction   opposite to the movement

P = 121 N Woman's force on the stroller, at an angle of 41.0° to the y-axis

x-y  components  of the F

Px= 121 N*sin41° = 79.38 N

Py= 121 N*cos41° =91.32 N

Stroller's acceleration forward

We apply the formula (1)  

∑Fx = m*a

Px - f  = m*a

79.38 - 4 = (21.1 )*a

75.38 = (21.1 )*a

a = 75.38 / (21.1 )

a = 3.57 m/s²

B fast-paced events that are more about the action than the description.

Explanation:

grav forces affect all objects magnetic forces affect magnetic objects and electric currents

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