Answer:
total energy lost = 16.1 KJ
Explanation:
Heat of vapor to water = 1.84j/gK is - because have a loss of energy
Heat lost during cooling from 155 to 100 = 1.84x 5 x(155 + 273 - 100+273) = 506J
latent heat of steam = 2260J/g x 5g = 11300J
Heat lost during cooling from 100 to 0 = 4.18 x5 x (100 - 0) = 2090J
Heat due to fusion is = 336J/g x 5g = 1680J
heat to cool ice of 0 to -55 = 2.09J/gK x 5g x (0 -(-55)) = 574.75J
the sum of all H = H of reaction
506J + 11300J + 2090J + 1680J + 574.75J = 16150.75J = 16.1KJ
total energy lost = 16.1 KJ
The force that the spring exerts is = 1.31 N
<h3>How can we calculate the force that the spring exerts?</h3>
The spring force in the spring depends on the spring's displacement and the force constant of the particular spring. The below expressions show the force that the spring exerts,
Here, we are given,
k= The spring constant of a spring = 8.75 N/m.
x= The displacement of the string is = 0.150 m
Now, we replace the known values in the above equation, we can find :
Or, 
Or, 
Or, F≈ 1.31 N
Now, from the above calculation we can conclude that the force that the spring exerts is 1.31 N.
Learn more about the Spring constant:
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Answer:
<h2>
E = 2.8028*10⁻¹⁹ Joules</h2>
Explanation:
The minimum energy needed to eject electrons from a metal with a threshold frequency fo is expressed as E = hfo
h = planck's constant
fo = threshold frequency
Given the threshold frequency fo = 4.23×10¹⁴ s⁻¹
h = 6.626× 10⁻³⁴ m² kg / s
Substituting this value into the formula to get the energy E
E = 4.23×10¹⁴ * 6.626 × 10⁻³⁴
E = 28.028*10¹⁴⁻³⁴
E = 28.028*10⁻²⁰
E = 2.8028*10⁻¹⁹ Joules
Answer:
1.) Displacement = 32.08m
2.) Velocity = 55km/h
3.) Acceleration = 94.29 km/h^2
Explanation:
Given that the train takes 35 minutes to cover the distance between the two towns. The train's average speed is 55 kilometers per hour. That is,
Time t = 35 minute
Convert it to hours by dividing it by 60
35/60 = 7/12 hours
Speed = 55 km/h
The displacement of the car is:
Displacement = 55 × 7/12 = 32.08 m
The velocity of the car will be 55 km/h
The acceleration of the car will be:
Acceleration = velocity/time
Substitute velocity and time into the formula
Acceleration = 55 ÷ 7/12
Acceleration = 94.29 km/h^2
Then the force will also be doubled
