1.Which of the chasces below represents the peferred practice regarding signific

Question

1.Which of the chasces below represents the peferred practice regarding significant figures when maltiptying the lowing: 1asis3,14880 a) 20013)290136 290 l0 e)29o 2· lfa isacceleration, r is veleny,.risposton, and t is time,then which equation is not dimensionally oxrecr? SA sinple peadulm, 200 m in lengh, is releaseod from rest when the support string is at an angle of 60.0° from the vertical. What is the sond of the suspeaded mass at the hotiom of the swing (Ignore air resistance, g-980 ms) a) 0.67 msams 1.3 ms )1.88 ms e)443 m's 4. A rock is thrown straight up with an initial velocity of 25.0 m's. What maximum height will the rock reach before starting to tall dowpwad? (Take acceleration due to gravity as 9.80 ms) a) 9.80 m 1.5m )196m )25 me)31.9 m . A70kg bowling ball a net force of 3.5 N. What will be its acceleration a) 35 ms b)0m's )50 s d) 0.71 m's e)05 ms 6 Which type of quantity is characterized by both magnitude and direction? )vector d) algebraic variable a) scalar b) trigonometric e) None of those. In a 2-dimensional Cartesian coontinate system the x-component of a given vector is equal to that a) sine b) cosine e) tangent) cotangent e) cogent how much work does gravity do on the jogger? 7. vector's manitude muliplied by which trigonormetric function, with respect to the angle between vector and y- axis? S. A hill is -10 m long and makes an angle of 12 with the horizontal. As a 50 kg jogger runs down the hill, a)4,9003 b) 1,0193 c)-1,0193 d) zeroe) not enough information [4 1 of 4

Explanation / Answer

1) (d) 2.9 x 102

Just multiply the given numbers:

10.50*3.14*8.80 = 290.136

Now we have to see that how many significant figures are there in each number:

15.50 -> 4 sf

3.14 -> 3sf

8.80 -> 3sf

The least no. of sf is 3.

So the result will be true upto 3 sf only.

So,290.136 ----> 290. (3sf)

In scientific notation:

= 2.90x 102

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