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vfiekz [6]
3 years ago
9

A player uses a hockey stick to push a puck at a constant velocity across the ice. The weight of the puck is 1.70 N. The coeffic

ient of friction is 0.0600. With what force must the player push the puck so that his force just equals the frictional force?
Chemistry
2 answers:
Mekhanik [1.2K]3 years ago
7 0
Force = mass × acceleration

static force = coefficient of friction × normal force 
1.70 = 0.0600 × normal force...
normal force = 1.70 ÷ 0.0600.. to obtain.... 
elena-14-01-66 [18.8K]3 years ago
3 0

Answer: The minimum force by which player should hit the puck to move it is 0.102 N.

Explanation:

Weight of the puck = 1.70 N

This weight of the puck is the force acting normal to the surface that is:

N = 1.70 N

The coefficient of friction =\mu _f=0.0600

Frictional force = F_f=\mu _f\times N=0.0600\times 1.70 N=0.102 N

The minimum force by which player should hit the puck to move it is 0.102 N.

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Answer:

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Explanation:

1)<u> Word equation (given)</u>

  • <em>calcium chlorate (solid) → solid calcium chloride (solid)  + oxygen (gas)</em>

2) <u>Chemical formulae of the reactant and products</u>:

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The most common oxidation states of chlorine are -1, +1, +3, +5, +7.

The suffix ate in chlorate means that chlorine atom is with the third lowest oxidation state (counting only the positive states). So, this is +5.

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Hence, the chemical formula of calcium chlorate is Ca(ClO₃)₂

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The suffix ide in chloride means that chlorine is with oxidation state -1. Again the oxidation state of calcium is +2.

Hence, the chemical formula of calcium chloride is CaCl₂

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Oxygen gas is a diatomic molecule, so its chemical formula is O₂.

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The symbols s and g (in parenthesis) indicate the solid and gas phases respectively.

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That equation is not balanced becasue the number of O atoms in the reactant side and in the product side are different.

4)<u> Balanced chemical equation:</u>

Add a 3 as coefficient in front of O₂(g), in the product side to balance:

  • Ca(ClO₃)₂ (s) → CaCl₂ (s) + 3O₂ (g)

Verify that all the atoms are balanced:

Atom    Reactant side      Product side

Ca             1                           1

Cl              2                          2

O              3×2 = 6                2×3 = 6

Conclusion: the equation is balanced and the final answer is:

  • Ca(ClO₃)₂ (s) → CaCl₂ (s) + 3O₂ (g)
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