3 years ago

7. Which phase changes require a gain of energy (heat)?

Physics

2 answers:

Keith_Richards [23]3 years ago

7 0

Answer:

Explanation:

adell [148]3 years ago

4 0

Answer:

Explanation:

When there is heat the water turns into vapour if not covered but will turn back to water if covered (condensation)

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A 70.0-kg ice hockey goalie, originally at rest, catches a 0.150-kg hockey puck slapped at him at a velocity of 35.0 m/s. Suppos

brilliants [131]

Answer:

v₂=- 34 .85 m/s

v₁=0.14 m/s

Explanation:

Given that

m₁=70 kg ,u₁=0 m/s

m₂=0.15 kg ,u₂=35 m/s

Given that collision is elastic .We know that for elastic collision

Lets take their final speed is v₁ and v₂

From momentum conservation

m₁u₁+m₂u₂=m₁v₁+m₂v₂

70 x 0+ 0.15 x 35 = 70 x v₁ + 0.15 x v₂

70 x v₁ + 0.15 x v₂=5.25 --------1

v₂-v₁=u₁-u₂ ( e= 1)

v₂-v₁ = -35 --------2

By solving above equations

v₂=- 34 .85 m/s

v₁=0.14 m/s

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3 years ago

All atoms of an element have the same number of__But within the same element there may exist atoms that have__numbers of__.Atoms

Elza [17]

Answer:

isotopes

Explanation:

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3 years ago

a light-year is ____ A. the amount of time it takes light to get to the nearest star B. the distance light travels in a day C. t

Vinil7 [7]

The Answer is C. the distance light travels in a year

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3 years ago

Read 2 more answers

What is the change in length of a 1400. m steel, (12x10^-6)/(C0) , pipe for a temperature change of 250.0 degrees Celsius? Remem

8090 [49]

Answer:

$\Delta L = 4.2 m$

Explanation:

As per the formula of thermal expansion we know that

$L = L_o(1 + \alpha\Delta T)$

so here we will have

$L_o = 1400 m$

$\alpha = 12 \times 10^{-6} per ^oC$

$\Delta T = 250 degree C$

so here change in the length of the rod is given as

$\Delta L = L - L_o$

$\Delta L = L_o \alpha \Delta T$

$\Delta L = 1400 (12 \times 10^{-6})(250)$

$\Delta L = 4.2 m$

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4 years ago

HELP!

Goryan [66]

Answer:

The solved problem is in the photo. Hope it helps.

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3 years ago