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4 years ago

At what temperature do the fahrenheit and kelvin scales have the same numerical value?

Physics

1 answer:

Anettt [7]4 years ago

5 0

Answer: 574.59 K

Hope this helps you out (◠‿◕)

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A concrete highway is built of slabs 12 m long .How wide should be the expansion cracks between the slabs at 15 Celsius to preve

morpeh [17]

Answer:

$x=4.2\ mm$

Explanation:

Given:

length of the concrete slab, $l=12\ m$

temperature of observation, $T_o=15^{\circ}C$

we've the coefficient of linear expansion for concrete, $\alpha=10^{-5}\ ^{\circ}C^{-1}$

lower temperature limit, $T_l=-30^{\circ}C$

upper temperature limit, $T_u=50^{\circ}C$

<u>Change in length due to temperature can be given as:</u>

$\Delta l=l.\alpha.(T_u-T_l)$

$\Delta l=12\times 10^{-5}\times (50-(-30))$

$\Delta l=0.0096\ m=9.6\ mm$

<u>Now at temperature 15°C:</u>

$\Delta l'=12\times 10^{-5}\times (15-(-30))$

$\Delta l'=0.0054\ m=5.4\ mm$

Hence the expansion crack between the slabs at this temperature must be:

$x=\Delta l-\Delta l'$

$x=9.6-5.4$

$x=4.2\ mm$

3 0

3 years ago

A cardboard box has four forces acting upon it, as shown in the diagram below. What is the magnitude of the unknown force, Funkn

AlekseyPX

Answer:

D) 11 N

Explanation:

F = mg

In the vertical

30 = m(9.8)

m = 3.06 kg

in the horizontal

F = ma

F(unknown) - 5 = 3.06(2.0)

F(unknown) = 11.12... N

5 0

3 years ago

The diagram below shows the movement of matter in a portion of the water cycle.

Alisiya [41]

Answer:

d) precipitation

Hope it helps you

And if you want to, pls mark it as the brainliest answer

7 0

3 years ago

it would not be safe to connect the electric cooker hob to the mains electricity supply by plugging it into a standard power soc

zvonat [6]

Answer:

Switches in mains circuits should always be included in the live wire so that when the switch is open no electrical energy can reach an appliance. If the switch is included in the neutral wire, electrical energy can still enter an appliance, and could possibly cause an electric shock (Figure 7.10).

Explanation:

5 0

4 years ago

Sometimes my music is played value can feel your body shaking explain what is happening in terms of resonance?

Jet001 [13]

Answer:

If you are standing next to loud music you will feel yourself vibrating because resonance happens. When an object vibrating at or near the resonant frequency of a second object then it causes the second object to vibrate. This phenomenon is called resonance.

Explanation:

Hope this helped! :))

8 0

3 years ago