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Anestetic [448]
3 years ago
7

Indigenous people sometimes cook in watertight baskets by placing hot rocks into water to bring it to a boil. What mass of 500ºC

rock must be placed in 4.00 kg of 15.0ºC water to bring its temperature to 100ºC, if 0.0250 kg of water escapes as vapor from the initial sizzle? You may neglect the effects of the surroundings and take the average specific heat of the rocks to be that of granite. (answer in kg)
Physics
1 answer:
scoray [572]3 years ago
4 0

Answer:

m = 4.65 kg

Explanation:

As we know that the mass of the water that evaporated out is given as

m = 0.0250 kg

so the energy released in form of vapor is given as

Q = mL

Q = (0.0250)(2.25 \times 10^6)

Q = 56511 J

now the heat required by remaining water to bring it from 15 degree to 100 degree

Q_2 = ms\Delta T

Q_2 = (4 - 0.025)(4186)(100 - 15)

Q_2 = 1.41\times 10^6J

total heat required for above conversion

Q = 56511 + 1.41 \times 10^6 = 1.47 \times 10^6 J

now by heat energy balance

heat given by granite = heat absorbed by water

m(790)(500 - 100) = 1.47 \times 10^6

m = 4.65 kg

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Answer:

8 m/s²

Explanation:

Given,

Force ( F ) = 4 N

Mass ( m ) = 0.5 kg

To find : -

Acceleration ( a ) = ?

Formula : -

F = ma

a = F / m

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= 40 / 5

a = 8 m/s²

It's acceleration is 8 m/s².

6 0
2 years ago
You have a battery marked " 6.00 V 6.00 V ." When you draw a current of 0.383 A 0.383 A from it, the potential difference betwee
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Answer:

V = 4.81 V

Explanation:

  • As the potential difference between the battery terminals, is less than the rated value of the battery, this means that there is some loss in the internal resistance of the battery.
  • We can calculate this loss, applying Ohm's law to the internal resistance, as follows:

        V_{rint} = I* r_{int}

  • The value of the potential difference between the terminals of the battery, is just the voltage of the battery, minus the loss in the internal resistance, as follows:

       V = V_{b} - V_{rint}  = 5.03 V = 6.0 V - 0.383 A* r_{int}

  • We can solve for rint, as follows:

         r_{int} = \frac{V_{b}-V}{I} =\frac{6.0V-5.03V}{0.383A} = 2.53 \Omega

  • When the circuit draws from battery a current I of 0.469A, we can find the potential difference between the terminals of the battery, as follows:

       V = V_{b} - V_{rint}  = 6.0 V - 0.469 A* 2.53 \Omega= 6.0 V - 1.19 V = 4.81 V

  • As the current draw is larger, the loss in the internal resistance will be larger too, so the potential difference between the terminals of the battery will be lower.
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Stephanie lives in California,and her cousin Thomas lives in France. which coordinate system would be most useful if the two wan
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3 years ago
The total weight of a car with passengers is 30,000N. The area of contact of each of the four tyres with the ground is 0.025m2.
vlabodo [156]

Answer:

<em>The minimum pressure car tire pressure is 300,000 Pa</em>

Explanation:

<u>Pressure</u>

It's a measure of the force exerted by an object per unit surface:

\displaystyle P=\frac{F}{A}

Where F is the force applied on a surface area A.

We are given the total weight of a car with passengers as Ft=30,000 N and we also know the area of contact of each tire with the ground as A=0.025 m^2.

The minimum pressure each tire can have is when the total weight is evenly distributed in all four tires, thus F=Ft/4=7,500 N.

Calculating the pressure:

\displaystyle P=\frac{7,500}{0.025}

P=300,000 Pa

The minimum pressure car tire pressure is 300,000 Pa

7 0
2 years ago
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Zina [86]

Answer:

Is that an actual question for school?

6 0
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