(11%) Problem 6: A contestant in a winter sports contest pulls a 49 kg cube of i
ID: 1259203 • Letter: #
Question
(11%) Problem 6: A contestant in a winter sports contest pulls a 49 kg cube of ice in the positive horizontal direction with a cord over his shoulders across a frozen lake as shown in the figure. Assume the coefficients of static and kinetic friction are 0.1 and Luk 0.03 A 50% Part (a) Calculate the minimum force F he must exert to get the cube sliding in newtons. sino coso tano 7 8 9 HOME 4 5 6 cotano asino acos0 1 2 3 atano acotano sinh0 cosh tanho cotanh0 Degrees O Radians Submit Hints: Feedback: A 50% Part (b) What is its acceleration in m/s2 once it starts to move. if that force is maintained? All content E 2014. TA, LLC 25 Grade Summary Deductions Potential 100% Submissions Attempts remaining: 3 10% per attempt detailed viewExplanation / Answer
a).........................By applying Newtons second law of motion
Fcos45-usFN=0
Fcos45-0.1(49)(10)=m(0)
Fcos45-49=0
F=49/cos45
F=69.29N This is the minimum force required to move the object in horizontal direction.
For acceleration
Fcos45-0.03(49)(10)=m(a)
a= (69.29cos45-14.7) / 49
a=0.69m/s2
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.