Physics Help, Please
posted by Michael .
A physics student is pulling on a 20 kg box that is sliding on the floor. The student applies a pulling force of 100 N using a rope at angle 30o
from the horizontal. The coefficient of kinetic friction between the box and the floor is 0.4. The acceleration of the box is closest to?
Thank you Daemon for all your help! :)

100 cos 30 = horizontal pull = 86.6 N
100 sin 30 = vertical pull = 50 N
Normal force = mg  50 = 146 N
Friction Force = .4*146 = 58.5 N
total horizontal force = 86.658.5 = 28.1 N
F = m a
28.1 = 20 a
a = 1.41 m/s^2
Respond to this Question
Similar Questions

Physics
A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. She pulls with a force of 100.0 N at an angle of 25.0° above the horizontal. The box has a mass of 25.0 kg, and the coefficient … 
physics
1. A student is dragging a 5 kg box along the floor. He pulls on the rope with a 25 Newton force. The rope is 37 degrees above horizontal. As the box slides 10 meters, it goes from a speed of 3 m/s to a speed of 7 m/s. a.) calculate … 
Physics
A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. She pulls with a force of 130 N at an angle of 30.0° above the horizontal. The box has a mass of 24.0 kg, and the coefficient … 
Physics
A physics student is pulling on a 20 kg box that is sliding on the floor. The student applies a pulling force of 100 N using a rope at angle 30o from the horizontal. The coefficient of kinetic friction between the box and the floor … 
physics
A student moves a box of books down the hall by pulling on a rope attached to the box. The student pulls with a force of 173 N at an angle of 27.5 above the horizontal. The box has a mass of 27 kg, and μk between the box and … 
Physics
A student moves a box of books down the hall by pulling on a rope attached to the box. The student pulls with a force of 179 N at an angle of 29.8 ◦ above the horizontal. The box has a mass of 42.2 kg, and µk between the box … 
physics
At the beginning of a new school term, a student moves a box of books by attaching a rope to the box and pulling with a force of F = 88.9 N at an angle of 56◦ , as shown in the figure. The acceleration of gravity is 9.8 m/s 2 … 
physics
At the beginning of a new school term, a student moves a box of books by attaching a rope to the box and pulling with a force of F=86.4 N at an angle of 64 degree. The acceleration of gravity is 9.8 m/s^2. The box of books has a mass … 
Physics
1.A student moves a box of books down the hall by pulling on a rope attached to the box. The student pulls with a force of 181 N at an angle of 20.8◦ above the horizontal. The box has a mass of 40.3 kg, and μk between the box and … 
physics
Starting from rest, a student pulls a (34) kg box a distance of (13.50) m across the floor using a (161) N force applied at 35.0 degrees above horizontal. The coefficient of kinetic friction is 0.220 between the floor and the box. …