1.Which of the choices below represents the preferred practice regarding signifi

Question

1.Which of the choices below represents the preferred practice regarding significant figures when multiplying the following: 10.50x3.14x8.80? a) 290.13 b) 290.136 c) 290.1 d)2.9x10 e) 290 2. If a is acceleration, v is velocity, x is position, and f is time, then which equation is not dimensionally correct? 3. A simple pendulum, 2.00 m in length, is released from rest when the support string is at an angle of 60.0° from the vertical. What is the speed of the suspended mass at the bottom of the swing? ( Ignore air resistance, g = 9.80 m/s2 ) a) 0.67 m/s b) 0.94 m/s c)1.33 m/s d) 1.88 m/s e) 4.43 m/s

Explanation / Answer

1. 10.50 x 3.14 x 8.80

= 290.136

least significant figure is 3.

so result will also have 3 significant figures.

Ans:(e) 290

2. Ans(c) v = a/t

3. Applying energy conservation,

- m g L cos60 + 0 = - m g L + m v^2 /2  

v = sqrt(2 x 9.8 x 2 x (1 - cos60))

v = 4.43 m/s

Ans(e)

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