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Angelina_Jolie [31]
3 years ago
12

List how many significant figures the numbers contain. A. 205 cm. B. .00004 cm. C. 20 cm. D. 20. Cm.

Physics
1 answer:
stiv31 [10]3 years ago
7 0
A. 205 cm
   This has 3 significant figures: 2,0 and 5.

B. 0.00004 cm
   This has 1 significant figure: 4

C. 20 cm
   This has 2 significant figures: 2 and 0.

D. 20. cm
    This has 2 significant figures: 2 and 0 
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Answer:

h = 16.67m

Explanation:

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\omega c=\sqrt{510*2/Ic}

Where the inertia is given by:

Ic=1/2*m_c*R_c^2=1/2*(8)*(0.15)^2=0.0225kg.m^2

Replacing this value:

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Speed of the block will therefore be:

V_b=\omega_c*R_c=106.46*0.15=15.969m/s

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0 = 510+1/2*m_b*V_b^2-m_b*g*h

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The crate is initially moving, so we must calculate the force of kinetic friction, which is given by:

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Substituting the numbers into the formula, we find

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