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Nitella [24]
3 years ago
5

A 20-kg wagon accelerates on a horizontal surface at 0.50 m⁄s2 when pulled by a rope exerting a 120-N force on the wagon at an a

ngle of 25° above the horizontal. Determine the magnitude of the effective friction force exerted on the wagon and the effective coefficient of friction associated with this force.

Physics
1 answer:
inn [45]3 years ago
5 0

Answer:

Explanation:

given,

mass of wagon = 20 Kg

horizontal acceleration = 0.5 m/s²

force of pull = 120 N

angle with horizontal = 25°

Applying newtons second law

F cos θ - f = m a

f = F cos θ- ma

f = 120 cos 25° - 20 x 0.5

f = 99 N

we know,

f = μ N

μ =\dfrac{f}{N}

μ =\dfrac{99}{mg - Fsin \theta}

μ =\dfrac{99}{20\times 9.8 - 120 sin 25^0}

μ = 0.68

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A child throws a ball vertically upward to a friend on a balcony 28 m above him. The friend misses the ball on its upward flight
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t=1.9 sec

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