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k0ka [10]
4 years ago
11

An object falls 210 m in 6.3 s. What was it's initial velocity? Express your answer with the correct number of significant digit

s.
Physics
1 answer:
KIM [24]4 years ago
8 0

Answer:

u = 2.5 \ m/s

Explanation:

Given data:

Height, h = 210 \ m

Time, t = 6.3 \ s

Let the initial velocity of the object be <em>u</em>.

From the kinematic equation,

h = ut + \frac{1}{2}gt^{2}

210 = u \times 6.3 + 0.5 \times 9.80 \times (6.3)^{2}

\Rightarrow \ u = 2.46 \ m/s

u = 2.5 \ m/s (rounding to tenth place)

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Qual a massa de água a 45 °C que devemos misturar com 200 g de água a 15 °C, para que o sistema entre em equilíbrio térmico a 35
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Responda:

400 g

Explicação:

Dado o seguinte:

Deixe Mass (m1) = m em t1 = 45 ° C

Massa (m2) = 200g em t2 = 15 ° C

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Usando a relação:

m1 * C * ΔT = m2 * C * ΔT

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