Question

A student pulls a rope attached to a box of books and moves the box down the hall. The student pulls with a force of 175N at an angle of 25.0º above the horizontal. The box has a mass of 35.0 kg and the coefficient of kinetic friction between the box and the floor is 0.280. Find the acceleration of the box.

1.65 m/s²
2.38 m/s²
3.72 m/s²
9.37 m/s²

Four forces act on a hot air balloon as shown below. Find the magnitude and direction of the resultant force on the balloon. Show your work and explain your answer

Answer 1

1) Normal reaction = 35(9.8) - 175sin(25) = 343 - 73.958 = 279.0418042 = 279 N Equation of motion 175cos(25) - (0.28)(279) = 35 a 158.60 - 78.12 = 35a 80.48 = 35a a = 80.48/35 = 2.299428571 = 2.3 m/s^2