18. If the radius of the semicircle below is 1m, what is a) the length of the da

Question

18. If the radius of the semicircle below is 1m, what is a) the length of the dashed semicicle b) the length of the solid line c) the length of the dash-point line 19. Three particles move with from Position 1 to Position 2 along separate paths. All three particles require the same amount of time to complete the trip. Which of the followings is the same for all three particles? A. average speed B. average horizontal velocity C. instantaneous acceleration D. distance traveled. 20. Select the correct expression for the velocity-time relation a) v = v0 + at b) v - v0 = at c) a = (v - v0) /t d) all the above 21. A particle starts from rest and accelerates at 10m/s2. How long does it take for the particle to reach a velocity of 40m/s? A. 1s B. 2s C. 3s D. 4s 22. What is the position-time relation? a) x - x0 = v0t + at2/2 b) x = x0 + v0t + at2/2 c) at2/2 = x-x0 - v0t d) all the above 23. A particle starts from rest and accelerates for 4 seconds at 10m/s2. What is its displacement from its initial position? E. 16m F. 40m G. 80m H. 120m 24. What is the position-time relation for the free fall? a) y - y0 = v0,yt - gt2/2 b) y = y0 + v0,yt - gt2/2 c) gt2/2 = -(y - y0 ) + v0,yt d) all the above 25. An object is dropped from height h and strikes the ground in time t. If the object is dropped from height of 2h, which of the following represents the time it will strike the ground? A. t B. 1.4t C. 2t D. 4t.

Explanation / Answer

18 length will be :r

r= radius

19. average velocity

20. v= vo + at

21. 40 = 0+ 10 t

t= 4 secconds

22. x= xo +vot + 1/2 at^2

23. d= 1/2 at^2 = 80 mts

24. y= yo + 1/2 gt^2

25 . h1/h2 = [t1/t2 ]^2

1.4 t

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