A stockroom worker pushes a box with mass 10.8 kg on a horizontal surface with a constant speed of 3.50 m/s. The coefficients of kinetic and static friction between the box and the surface are 0.220 and 0.530, respectively. For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Delivering the goods. Part A What horizontal force must the worker apply to maintain the motion of the box? Express your answer in newtons. Assume that + direction coincides with the direction of velocity. ▸ View Available Hint(s) F₂ = 23.3 N Submit ✓ Correct Part B Previous Answers If the worker stops pushing, what will be the acceleration of the box? Express your answer in meters per second squared. Assume that + direction coincides with the direction of velocity. ▾ View Available Hint(s) ▼ Hint 1. How to approach the problem In Part A, you would have found an expression for the motion of the box in the horizontal direction using Newton's second law. In that expression, let the force applied by the worker equal zero and assume the box is accelerating. You should then be able to obtain an expression for the acceleration of the box. Be sure to consider the direction of the forces. IVE ΑΣΦ a₂ = 23.3 ? m/s²

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Chapter1: Units, Trigonometry. And Vectors
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A stockroom worker pushes a box with mass 10.8
kg on a horizontal surface with a constant speed of
3.50 m/s. The coefficients of kinetic and static
friction between the box and the surface are 0.220
and 0.530, respectively.
For general problem-solving tips and strategies for
this topic, you may want to view a Video Tutor
Solution of Delivering the goods.
Part A
What horizontal force must the worker apply to maintain the motion of the box?
Express your answer in newtons. Assume that + direction coincides with the direction of velocity.
► View Available Hint(s)
F₂ = 23.3 N
Submit
Previous Answers
✓ Correct
Part B
If the worker stops pushing, what will be the acceleration of the box?
Express your answer in meters per second squared. Assume that +z direction coincides with the
direction of velocity.
▾ View Available Hint(s)
Hint 1. How to approach the problem
In Part A, you would have found an expression for the motion of the box in the horizontal direction
using Newton's second law. In that expression, let the force applied by the worker equal zero and
assume the box is accelerating. You should then be able to obtain an expression for the acceleration of
the box. Be sure to consider the direction of the forces.
[-] ΑΣΦ
a = 23.3
?
m/s²
Transcribed Image Text:A stockroom worker pushes a box with mass 10.8 kg on a horizontal surface with a constant speed of 3.50 m/s. The coefficients of kinetic and static friction between the box and the surface are 0.220 and 0.530, respectively. For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Delivering the goods. Part A What horizontal force must the worker apply to maintain the motion of the box? Express your answer in newtons. Assume that + direction coincides with the direction of velocity. ► View Available Hint(s) F₂ = 23.3 N Submit Previous Answers ✓ Correct Part B If the worker stops pushing, what will be the acceleration of the box? Express your answer in meters per second squared. Assume that +z direction coincides with the direction of velocity. ▾ View Available Hint(s) Hint 1. How to approach the problem In Part A, you would have found an expression for the motion of the box in the horizontal direction using Newton's second law. In that expression, let the force applied by the worker equal zero and assume the box is accelerating. You should then be able to obtain an expression for the acceleration of the box. Be sure to consider the direction of the forces. [-] ΑΣΦ a = 23.3 ? m/s²
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