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Pavlova-9 [17]
3 years ago
10

The slope of the line on a speed-time graph tells the speed.

Physics
1 answer:
iren2701 [21]3 years ago
8 0

From the choices provided, the better answer is ' T ' .

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I think the answer is A) Power

Explanation:

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Liquid ammonia (boiling point = –33.4°C) can be used as a refrigerant and heat transfer fluid. How much energy is needed to heat
Contact [7]

Answer:

39.4 kJ

Explanation:

Given mass = 25.0 g

Specific heat of ammonia (g) = 4.7 J/g.K

Specific heat of ammonia (l) = 2.2 J /g.K

ΔHvap  = 23.5 x 10³ J /mol

Heating liquid ammonia from -65 °C to -33.4°C

Q₁ = m s ΔT  =  = 25.0 g * 4.7 J/g.K * [-33.4 - (-65)] °C = 3713 J

Evaporating 25 g of ammonia at -33.4°C

Molar mass of ammonia = 17 g/mol

Thus, moles = 25 / 17 moles

Q₂ = (25 / 17) mol * ΔHvap   = 1.470 mol * 23.5 x 10³ J /mol  = 34558.8 J

Heating NH₃(g) from -33.4°C  to -12.0°C

Q₃ = m s ΔT  =  = 25.0 g * 2.2 J/g.K * [-12.0 - (-33.4)] °C = 1177 J    

<u>Total heat energy = Q₁ + Q₂ +Q₃  = 39448.8 J  = 39.4 kJ (As 1 J = 10⁻³ kJ)</u>

                                 

                                   

6 0
3 years ago
The three scientists credited with using all available data and correctly determing the sturcture of dna from many years of prev
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These scientists discovered the structure of DNA in 1953  and they received, and they receive a Nobel Prize in Physiology or Medicine for their discovery

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Two ways strong and weak forces are alike?
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Two ways that strong nuclear and weak nuclear forces are alike: Strong nuclear and weak nuclear their alike because they deal with atoms and subatomic particles. ... Two ways that electromagnetic force and gravity are alike: Electromagnetic force and gravity are alike because both of them has an infinity force.

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3 years ago
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guapka [62]

Answer:

A black hole is a region of space having a gravitational field so intense that no matter or radiation can escape.

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Sorry if this isn't what you meant or were looking for.

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