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Nataliya [291]
3 years ago
13

How does a thermo flask retain heat​

Physics
1 answer:
Hoochie [10]3 years ago
7 0

Answer:

A thermo flask has a <u>cork</u> which prevents heat loss by <u>conduction</u><u>.</u>

It also has <u>vacuum</u> which prevents heat loss by <u>convection.</u>

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A power transmission line is hung from metal towers with glass insulators having a resistance of 1.00×109 Ω . What current flows
Hunter-Best [27]

Answer:

The current flows through the insulator is 2 mA.

Explanation:

Given that,

Resistance R=1.00\times10^{9}\ \Omega

Voltage = 200 kV

We need to calculate the current

Using ohm's law

V=IR

I=\dfrac{V}{R}

Where, I = current

V = voltage

R = resistance

Put the value into the formula

I=\dfrac{200\times10^{3}}{1.00\times10^{9}}

I=0.0002\ A

I=2\ mA

Hence, The current flows through the insulator is 2 mA.

5 0
4 years ago
2. A new racecar track is being created, and the owners want the cars to complete 10
jeka57 [31]

Answer:

0.45 miles

Explanation:

since, car will be running on the edge of track, distance covered in one lap by car will be equal to circumference of track.\

we will use value of pi as 22/7

Circumference for any circular shape is given by \piD\pi D

Hence, in one lap \pi D distance will be covered

in 7 laps 7 \pi D distance will be covered.

but is given that 7 laps should be equal to 10 miles

so 10 miles will be equal to 7\pi D

7\pi D= 10 \ miles\\=> 7*(22/7)* D= 10 \ miles\\=> 22D = 10 \ miles\\=> D = 10/22 \ miles\\=> D = 0.45 \ miles

Thus, diameter of track will be 0.45 miles to meet the requirement.

3 0
3 years ago
Newton’s ideas on physics “won”, and aristotle’s ideas were kicked out of science and over into history. why?
mestny [16]
Basically, Newton's ideas matched up better with experiments and observations about the natural world than Aristotle's did. Newton gave a rigorous mathematical framework that made very specific predictions about our world, while Aristotle in general made more comparative laws, that even when true were less useful than the certainty Newton's laws gave us. Many of Newton's laws have been found to be at least partially incorrect now, for instance his laws of motion fall apart at speed nearing the speed of light, his laws of gravity fall apart when talking about more than two objects and in the presence of large gravitational fields that are close together, and Newton's law of cooling is just untrue in general (though can make some approximations in narrow temperature ranges).
4 0
3 years ago
Which law can be used to calculate the number of moles of a contained gas?
sweet [91]
The Ideal Gas Law
The Ideal Gas Law (PV = nRT) can be used if you have pressure, volume, and temperature.Apr
3 0
4 years ago
A 2.8-carat diamond is grown under a high pressure of 58 × 10 9 N / m 2 .
Rzqust [24]

Answer:

a)  ΔV = 2,118 10⁻⁸ m³   b)  ΔR= 0.0143 cm

Explanation:

a) For this part we use the concept of density

    ρ = m / V

As we are told that 1 carat is 0.2g we can make a rule of proportions (three) to find the weight of 2.8 carats

    m = 2.8 Qt (0.2 g / 1 Qt) = 0.56 g = 0.56 10-3 kg

   

    V = m / ρ

    V = 0.56 / 3.52

    V = 0.159 cm3

We use the relation of the bulk module

    B = P / (Δv/V)

    ΔV = V P / B

    ΔV = 0.159 10⁻⁶ 58 10⁹ /4.43 10¹¹

    ΔV = 2,118 10⁻⁸ m³

b) indicates that we approximate the diamond to a sphere

    V = 4/3 π R³

For this part let's look for the initial radius

    R₀ = ∛ ¾ V /π

    R₀ = ∛ (¾ 0.159 /π)

    R₀ = 0.3361 cm

Now we look for the final volume and with this the final radius

    V_{f} = V + ΔV

    V_{f} = 0.159 + 2.118 10⁻²

    V_{f} = 0.18018 cm3

    R_{f} = ∛ (¾ 0.18018 /π)

    R_{f} = 0.3504 cm

The radius increment is

    ΔR = R_{f} - R₀

    ΔR = 0.3504 - 0.3361

    ΔR= 0.0143 cm

4 0
3 years ago
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