p0 d 5:42pm nts Quiz Instructions Please answer the 8 questions regarding the fo

Question

p0 d 5:42pm nts Quiz Instructions Please answer the 8 questions regarding the following scenarios. I have not put a time limit other than the due date of Friday at 11:59PM. Hopefully this quiz will require less than 1 hour of your time. Future quizzes may require an access 10 Code obtain during discussion classes and also have a time limit. Questions 1-3 Refer to the following situation A block is on a plane inclined at an angle a-30° from the horizontal. The coefficient of the kin the block and the incline is 0.12. A force is applied along the incline to a figure 1, and the mass moves up the incline at constant velocity v 2 m/s. etic friction between ine is .: 0.12. A force is applied along the incline to a block of mass m-2 kg as shown in Time El Attempt s 0 Minut ons ery o30 Figure 1- For questions 1-3 Questions 4-6 Refer to the following situation

Explanation / Answer

1] F - mgsin30 - ukmgcos30 = 0

F = 2(9.8)sin30 + 0.12(2)(9.8)cos30 = 11.837 N

the work done in 0.6 seconds is:

W = 11.837 x 0.6 x 2 = 14.20 J [2nd option].

2] The normal force does zero work on the object since the angle between the displacement and the force is 90o. [3rd option]

3] F - mgsin30 - ukmgcos30 = ma

11.837 - 2(9.8)sin31 + 0.12(2)(9.8)cos31 = 2a

=> a = - 0.137 m/s2

Distance covered in 0.6 s is:

S = 2(0.6) - (1/2)(0.137)(0.6)2 = 1.175 m which is smaller than 1.2 m

so, from Work Energy theorem, change in kinetic energy will be negative since the velocity at 0.6s is smaller than at t=0.

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