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Mashcka [7]
3 years ago
15

A first place finisher in a cross country meet ran 5,000 meters in 871.7 seconds. What was his average speed?​

Chemistry
1 answer:
Serjik [45]3 years ago
6 0

Answer : His average speed was, 5.735 m/s

Solution : Given,

Total distance covered = 5000 meter

Total time taken = 871.7 seconds

Average speed : It is defined as the total distance covered in total amount of time.

Formula used :

\text{Average speed}=\frac{\text{Total distance covered}}{\text{Total time taken}}

Now put all the given values in this formula, we get his average speed.

\text{Average speed}=\frac{5000m}{871.7s}=5.735m/s

Therefore, his average speed was, 5.735 m/s

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How dose heat travel between objects that are touching one another?
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What os the formula for hexaboron tetrabromide
LekaFEV [45]

Answer:

B6Br4

Explanation:

Chemical formula gives a representation of the number of atoms that each element in a compound or molecule. In this question which is asking to give the formula of hexaboron tetrabromide, the hexa means 6 while the tetra means four.

Since the number of atoms of each element is written as a prefix before the main element, this means that the chemical formula of hexaboron tetrabromide will be B6Br4.

6 0
3 years ago
7. How much ice is left over if 46 kJ of energy is added to 175 g of ice?
velikii [3]

Answer:

m_{leftover}=37g

Explanation:

Hello!

In this case, since the melting process involves the heat added to the system, the heat of fusion and the mass of water:

Q=m\Delta H_{fus}

Thus, as it has been reported that the heat of fusion of ice is 333.6 J/g, we can compute the melted mass of ice as shown below:

m=\frac{Q}{\Delta H_{fus}} =\frac{46000J}{333.6J/g}\\\\m=138g

Thus, the ice leftover results:

m_{leftover}=175g-138g\\\\m_{leftover}=37g

Regards!

6 0
3 years ago
The concentration of calcium in a cell is 0.3%. The concentration of calcium in the surrounding fluid is 0.1%. How could the cel
iragen [17]

Answer:

Primary active transport                                                                                              

Explanation:

In a cell, the movement of molecules like calcium ions (Ca²⁺), <em>to a region having high solute concentration from a region having low solute concentration, through the cell membrane requires metabolic energy</em> and is known as Primary active transport.

It is given that the concentration of calcium in the cell (0.3%) is greater than the concentration of calcium in the fluid surrounding the cell (0.1%). <em><u>So the calcium ions move into the cell and the cell obtains more calcium. </u></em>

<u>Therefore, the cell obtains more calcium by the process of Primary active transport.</u>

4 0
3 years ago
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