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2 years ago

A football player runs down a field with a speed of 8 m/s. How long will it take him to run 20m?

2 answers:

5 0

To find the answer for this question, you simply need to divide 20 by 8, which is the speed he is traveling.

20 / 8 = 2.5

The football player will run 20 yards in 2 1/2 seconds.
Hope that helped! =)

Charra [1.4K]2 years ago

3 0

Answer:

Time taken, t = 2.5 seconds

Explanation:

It is given that,

Speed of the football player, v = 8 m/s

We have to find time taken by the football player to run 20 m. It can be calculated suing the formula of speed of the player i.e.

$s=\dfrac{d}{t}$

d = distance

t = time taken

$t=\dfrac{d}{s}$

$t=\dfrac{20\ m}{8\ m/s}$

t = 2.5 seconds

Hence, time taken by the football player is 2.5 seconds

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Answer:

The final pressure of the gas is 9.94 atm.

Explanation:

Given that,

Weight of argon = 0.16 mol

Initial volume = 70 cm³

Angle = 30°C

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We need to calculate the initial pressure of gas

Using equation of ideal gas

$PV=nRT$

$P_{i}=\dfrac{nRT}{V}$

Where, P = pressure

R = gas constant

T = temperature

Put the value in the equation

$P_{i}=\dfrac{0.16\times8.314\times(30+273)}{70\times10^{-6}}$

$P_{i}=5.75\times10^{6}\ Pa$

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Using relation pressure and volume

$P_{2}=\dfrac{P_{1}V_{1}}{V_{2}}$

$P_{2}=\dfrac{56.827\times70}{400}$

$P_{2}=9.94\ atm$

Hence, The final pressure of the gas is 9.94 atm.

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2 years ago

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3 years ago

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Explanation:

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