Final Exanm Select the multiple choice option which best completes the statement

Question

Final Exanm Select the multiple choice option which best completes the statement or answers the question 1 ?would the precision of the measurement improve if Physies 105 the paperclip were smaller? a. Yes. b. No, it would be the same. c. No, it would be worse. Inches 2.Neglecting air friction, how far does a ball fall during a length of time, t, to the surface of the Earth? a. y 2g b.y=gt 3. How long does it take a ball to fall a vertical distance, y, to the surface of the Earth? a, t= 4. ? How fast was the ball at the right initially thrown??, 4.9 m - 20 m 5. A cargo ship is seen moving exactly North. Later, the same ship is seen heading exactly Southeast (45° South of East). Which of the following vector drawings represent this change in velocity due to acceleration? LEE KEY SHIPPING a. 6.The force of friction between two surfaces will increase when a. the area of the contact surface increases. b. the coefficient of friction between the surfaces is a smaller number. c. the normal force between the two surfaces increases. d. Teflon is put between the surface.

Explanation / Answer

1) (b) would be same

2) y = ut+1/2gt^2

u=0

y=1/2gt^2

Ans : (c)

3) y = 1/2gt^2

t = sqrt(2y/g)

Ans : (b)

4) y = 1/2gt^2

t = sqrt(2y/g)

Vx = x/t = x* sqrt(g/2y)

Ans : (b)

5) Ans: (b)

6)F= mu*N

Friction force is proportiona to normal reaction.

Ans: (c)

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