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2 years ago

A car moves with an average speed of 45miles /hour. How long does the car take to travel 90miles?

Chemistry

2 answers:

storchak [24]2 years ago

3 0

Averqge speed of the car = 45 miles/hr, which means,

The car travels 45 miles in 1 hr.

Using unitary method,

The car travels 45 miles in 1 hr

The car would travel 1 mile in 1/45 hrs

The car would travel 90 miles in 1/45×90 hrs

So, calculating this,

1/45×90 = 2 hrs

Lemur [1.5K]2 years ago

3 0

Answer:

actually this is physics

d=s×t

∴45×90⇒4050km

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The temperature of 6.24 L of a gas is increased from 25.0°C to 55.0°C at constant pressure. The new volume of the gas is Questio

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Heating this gas to 55 °C will raise its volume to 6.87 liters.

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By Charles's Law, under constant pressure the volume $V$ of an ideal gas is proportional to its absolute temperature $T$ (the one in degrees Kelvins.)

Alternatively, consider the ideal gas law:

$\displaystyle V = \frac{n \cdot R}{P}\cdot T$ .

$n$ is the number of moles of particles in this gas. $n$ should be constant as long as the container does not leak.
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$P$ is the pressure on the gas. The question states that the pressure on this gas is constant.

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Initial volume: $V_1 = \rm 6.24\; L$ .

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Initial temperature: $T_1 = \rm 25.0\;\textdegree{C} = (25.0 + {\rm 273.15})\; K = 298.15\;K$ .
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