Answer:
Refraction is the slowing down of light waves as they pass into a different medium and speeding as they pass out.
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Answer:
Biodiversity decline continues due to a rapidly expanding human population. Habitat is damaged in order to meet growing needs for agriculture, urban development, water and materials. Fish, wildlife and plants are overharvested, despite mounting evidence that many harvesting practices are unsustainable.
Answer:
No, not necessarily
Explanation:
If a particle moves with an acceleration that induces its velocity to be reduced, then there will be a moment when it reaches v= 0, but this does not automatically mean that the acceleration will no longer act. When, the body resumes its motion,with the same acceleration, then velocity is negative.
For example when ball thrown from the ground reaches it's maximum height, it that instant it's velocity is zero but acceleration is g m/s^2 acting downward
Answer:
Explanation:
Given that,
Mass = 5kg of water
Initial pressure P•i = 5bar = 500 kPa
Pressure is constant P = 5bar
Initial temperature T•i = 360°C
Heat transferred Q = 2660 KJ
Kinetic and potential energy are negligible
a. Final volume
The initial enthalpy and specific volume can be determine from the steam table.
h•1 = 3188.83 KJ/kg
v•1 = 0.5796 m³/kg.
So, we can calculate the final enthalpy by using
Q = m(h2—h•1)
2660 = 5 (h2—3188.83)
2660/5 = h2—3188.83
h2 — 3188.83 = 532
h2 = 520 + 3188.83
h2 = 3720.83 KJ/kg.
Using steam table, we can determine the final temperature and final specific volume
T•f = 608°C
v•f = 0.8115 m³/kg
Then, specific volume = volume /mass
v•f = v2/m
v2 = vf × m
v2 = 0.8115 × 5
v2 = 4.0575m³
b. Workdone?
W = m•P•(vf —vi)
W = 5 × 500(0.8115 — 0.5796)
W = 579.75 KJ
