Handout 3.1 THINKING CRITICALLY: Evaluating Questions and Answers To soloe the p

Question

Handout 3.1 THINKING CRITICALLY: Evaluating Questions and Answers To soloe the problem below, you must write a clear and comvincing jpestifcation for acepting one of the peossible answer choices as the best or most appropriate and for rejecting each of the other choices as less appropriate Your reasons for rejecting choices are just as important as your reasons for choosing the best anser An archer shoots an arrow at 45° to the horizontal. The arrow falls to earth just short of a wall 75 m from the archer. Which of the following should the archer do to insure that a second arnow will dlear the wall? a. Determine the height of the wall and move away from the wall that distance. b. Shoot the arrow at less than 45 to the horizontal. c. Shoot a lighter arrow. d. Shoot the arrow at more than 45° to the horizontal. Shoot the arrow with a greater velocity

Explanation / Answer

1.

Here,   u2sin2(theta)/g   = 75

    =>   u2sin90/g   = 75

     =>   u = 27.11 m/sec

=>   the height of the wall = ((27.11)2 * sin245)/(2*9.8)

                                          = 18.748 m

=>   to insure that a second arrow will clear the wall   -    Shoot the arrow with a greater velocity.

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