Answer:
Diphtheria.
Explanation:
Diphtheria can be defined as an acute or highly contagious (infectious) disease of the upper respiratory tract and the nose. It is characterized by the inflammation of the mucous membrane, as well as causing hindrances to proper breath and ingestion through the formation of a false membrane in the throat of living organisms.
Diphtheria is a bacterial disease caused by bacillus Corynebacterium diphtheria excreting a potent toxins in the blood that spreads easily. Therefore, if not treated on time, it could lead to a fatal heart attack, nerve damage or paralysis and death in some cases. Some of the symptoms of diphtheria are fever, sore throat and breathing disorder.
Hence, diphtheria is a disease which affects the throat of living organisms such as humans.
Additionally, diphtheria can be prevented through the use of vaccines or immunization.
The first true automobile was invented in 1885/1886 by Karl Benz
Answer a) roof equilibrium temperature is 400K
Explanation:
The roof surface is sorrounded by ambient air whose temperature is 300K and which has a convective coefficient h of 10W/m2-K.
This means that heat will be conducted to the roof from the air around at an heat Flux of 300K x 10W/m2-K = 3000w/m2
For a clear solar day with solar heat Flux of 500W/m2, total heat Flux on roof will be
Q = 500 + 3500 = 3500W/m2
Q = h(Tr-Ta)
Ts is temperature of roof,
Ta is temperature of air
3500 = 10(Tr - 50)
350 = Tr - 50
Tr = 400k
Answer b): roof equilibrium temperature will be 350K
Explanation:
At night total heat Flux is only due to hot ambient air sorrounding the surface of the roof.
Q = 3000W/m2
Q = h(Tr-Ta)
3000 = 10(Tr-50)
300 = Tr - 50
Tr = 350K