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tigry1 [53]
2 years ago
12

If a flea can jump straight up to a height of 0.550 m , what is its initial speed as it leaves the ground?

Physics
1 answer:
olga55 [171]2 years ago
7 0
Let u = upward initial speed of the flea.

At the maximum height of h = 0.550 m, the vertical velocity is v = 0.
Therefore, from the formula
 v² = u² - 2gh,
obtain
0 = u² - 2*(9.8 m/s²)*(0.55 m) 
u² = 10.78 m²/s²
 u = 3.283 m/s

Answer: The initial upward speed is 3.28 m/s (nearest thousandth)

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8 0
2 years ago
We want to find how much charge is on the electrons in a nickel coin. Follow this method. A nickel coin has a mass of about 4.2
monitta

Answer:

The number of atoms is N = 4.37*10^{22} \ atoms

Explanation:

From the question we are told that

                 The mass of coin  is m_n = 4.2g

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Now the relation to obtain the number of atom in  the  nickel coin is

                        N = \frac{Mass \ of Nickel\ coin}{Molar \ mass\ of nickel }  * No\ of\atoms \ in \ \ one\  mole\ of\ nickel

                           = \frac{4.2}{57.8}* 6.02*10^{23}

                           =4.37 *10^{22} atoms

                 

     

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