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photoshop1234 [79]
3 years ago
15

Steam (water vapor) at 100 degrees Celsius is added to a thermally insulated container with 200 kg of ice at zero degrees Celsiu

s. The final mixture is water at 30 degrees Celsius. What was the initial mass of the steam?
Physics
1 answer:
Ivan3 years ago
8 0

Answer:

m  = 359.24 kg

Explanation:

given data:

mass of ice  = 200 kg

latent heat of steam  = 2260 kJ/kg

latent heat of ice = 334 kJ/kg

from conservatioon of energy principle we know that

heat lost by steam will be equal to heat gained by ice

therefore we have

( ml + mcdt) = (ml + mcdt)

m*2.26*10^6 + m*4186*(100-30) = 200*3.33 *10^6 + 2000*4186 *30

m  = 359.24 kg

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Ocean waves are caused by Question 11 options: density the wind thermal energy the moon
Lemur [1.5K]

Answer:

The wind !

Explanation:

7 0
3 years ago
Luis rushes 40m toward his truck. He notices he forgot his shoes and returns back to his house. His total travel time is 60s.
Alenkinab [10]

Answer:

1. The average speed of Luis over the 60 s is 1.33 m/s

2. The average velocity of Luis over the 60 s is zero.  

Explanation:

1. The average speed can be calculated with the following equation:

S = \frac{d}{t}

Where:

d: is the total distance traveled

t: is the total time = 60 s

The total distance can be calculated by the sum of the distance traveled to the truck (40 m) and the distance traveled to his home (the same 40 m), as follows:

d = 40 m + 40 m = 80 m

So, the average speed is:

S = \frac{d}{t} = \frac{80 m}{60 s} = 1.33 m/s

Hence, Luis's average speed over the 60 s is 1.33 m/s.

 

2. Now, the average velocity is a vector given by:

v = \frac{\Delta x}{\Delta t} = \frac{x_{f} - x_{i}}{t}

Where:

x_{f}: is the final distance traveled (the way to his home) = 40 m

x_{i}: is the initial distance traveled (the way to his truck) = 40 m

Δt: is the total time = t = 60 s

Given that Luis in his journey, returns to the same starting point (his house), the total displacement is zero, and so the average velocity is also zero:                              

v = \frac{x_{f} - x_{i}}{t} = \frac{40 m - 40 m}{60 s} = 0

Therefore, Luis's average velocity over the 60 s is zero.  

I hope it helps you!                                              

3 0
3 years ago
The higher the temperature of the conductor, the lower the resistance. True or false?
Yanka [14]
False. The resistance of a conductor typically rises with temperature.
7 0
3 years ago
2. What is the final velocity of an object that is traveling at 5.0 m/s and accelerates at
Elena L [17]

Answer:

22.74 m/s

Explanation:

u= 5.0

a= 2.4

t= 7.39

Therefore the final velocity can be calculated as follows

v = u + at

v= 5 + 2.4(7.39)

v= 5 + 17.736

v= 22.74 m/s

Hence the final velocity of the object is 22.74 m/s

3 0
4 years ago
Whta is the mechanical advantage when the effort force is 20 and the resistance force is 5
pogonyaev
The mechanical advantage would be 4. 20/5=4
7 0
3 years ago
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