An apple has a density of 641 kg/m3. Water has a

Physics

1 answer:

Vlad [161]3 years ago

6 0

Answer:

Explanation:

Since the apple is 641kg/m3 and water is 1000kg/m3 then the apple will float. Light materials float on top of the water similar to how oil is always on top of the water layer. Since the two are close so the apple will partially float

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TEA [102]

The coefficient of kinetic friction for the rough horizontal surface is 0.66.

The given parameters;

mass of the object, m = 1 kg
length of the inclined plane, L = 8 m
angle of inclination of the plane, θ = 30⁰
distance traveled before hitting the spring, d₁ = 4 m
distance traveled after hitting the spring, d₂ = 1.3 m
the spring constant, k = 26.5 N/m

Apply work-energy theorem; the work done the force of friction is equal to the energy stored in the spring.

$F_kd_1 = \frac{1}{2} kd_2^2\\\\\mu_kmg cos(\theta)d_1 = \frac{1}{2} kd_2^2\\\\\mu_k(1 \times 9.8 \times cos(30)\times 4) = \frac{1}{2} \times 26.5 \times (1.3)^2\\\\33.95\mu_k = 22.39\\\\\mu_k = \frac{22.39}{33.95} \\\\\mu_k = 0.66$

Thus, the coefficient of kinetic friction for the rough horizontal surface is 0.66.

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