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joshi gorle Grade: 12

1. The position of a 2.75⋅105 N training helicopter under test is given by r = (0.020 m/s3 )t3 I

+ (2.2m/s)t j - (0.060m/s2 )t2 k. Find the net force on the helicopter at t = 5.0 s.

2. A stockroom worker pushes a box with mass 11.2 kg on a horizontal surface with a constant speed of 3.50

m/s. The coefficient of kinetic friction between the box and the surface is 0.20. (a) What horizontal force

must the worker apply to maintain the motion? (b) If the force calculated in part (a) is removed, how far does

the box slide before coming to rest?


6 years ago

Answers : (1)

879 Points

Dear student,

Word done is given by W=f.d

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Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

6 years ago
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