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Mrac [35]
3 years ago
6

The atoms family atomic

Physics
1 answer:
Ad libitum [116K]3 years ago
6 0
Atoms family is molecules or a tv shoe
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Real and erect

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G Railroad tracks are made from segments L = 79 m long at T = 20° C. When the tracks are laid, the engineers leave gaps of width
Andreyy89

Answer:

l=L\alpha(T_c-T)

Explanation:

L = Initial length of segment = 79 m

T = Normal temperature = 20^{\circ}\text{C}

l = Width to be left for expansion

\alpha = Coefficient of linear expansion of the material = 12\times 10^{-6}^{\circ}\text{C}^{-1}

T_c = Maximum temperature = 39.5^{\circ}\text{C}

\Delta T = Change in temperature = T_c-T

The expression of linear expansion is given by

l=L\alpha\DeltaT\\\Rightarrow l=L\alpha(T_c-T)

The expression for the minimum gap distance l the engineers must leave for a track rated at temperature T_c is l=L\alpha(T_c-T)

8 0
3 years ago
Một sóng cơ học có tần số 50hz lan truyền dọc theo một sợi dây rất dài biết rằng sau 5 giây sóng truyền được 1 đoạn 25m dọc theo
Oliga [24]

Answer:

10 cm

Explanation:

Được

Tần số = 50 hertz

Khoảng cách đã đi = 25 m

Thời gian đi quãng đường 25 m = 5 giây

Tốc độ của sóng = 25/5 = 5 mét trên giây

Như chúng ta biết

Bước sóng = Vận tốc / tần số

Bước sóng = 5 mét trên giây / 50 trên giây

Bước sóng = 0,1 m = 10 cm

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A couple of ice cubes float in a glass of water. Will the water level in the glass
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Yes, the water level in the glass will decrease as the icecubes melt, this is a due to water displacement.

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This timeline correctly shows the order of time periods in the Mesozoic Era.
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It goes triassic, Jurassic, Cretaceous
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