Answer:
Explanation:
a ) Heat energy given out by 40 people
= 40 x 80 = 3200 J in one second
Heat energy given out by 10 light bulbs
= 10 x 100 = 1000 J in one second
Heat transfer by wall = 15000 x 1000 J in one hour
= 15000 x 1000 / 60 x 60
= 4166.67 J in one second
Total energy
= 3200 + 1000 + 4166 .67 J in one second
= 8366.67 J
To drive this much of heat , we need 2 air -conditioner of 5000 W each.
b ) Source of heat for bulb is electrical energy of bulb
For the students , source of heat by student is the bio- chemical reactions taking place in the body of the student which is exothermic.
Answer:
a) 254.6 GPa
b) 140.86 GPa
Explanation:
a) Considering the expression of rule of mixtures for upper-bound and calculating the modulus of elasticity for upper bound;
Ec(u) = EmVm + EpVp
To calculate the volume fraction of matrix, 0.63 is substituted for Vp in the equation below,
Vm + Vp = 1
Vm = 1 - 0.63
Vm = 0.37
In the first equation,
Where
Em = 68 GPa, Ep = 380 GPa, Vm = 0.37 and Vp = 0.63,
The modulus of elasticity upper-bound is,
Ec(u) = EmVm + EpVp
Ec(u) = (68 x 0.37) + (380 x 0.63)
Ec(u) = 254.6 GPa.
b) Considering the express of rule of mixtures for lower bound;
Ec(l) = (EmEp)/(VmEp + VpEm)
Substituting values into the equation,
Ec(l) = (68 x 380)/(0.37 x 380) + (0.63 x 68)
Ec(l) = 25840/183.44
Ec(l) = 140.86 GPa
Answer:
The correct option is;
Neither A nor B
Explanation:
The location of the where the thread wears in tire that has too high inflation is at the thread pattern center due to the reduced size of the contact patch with the load of the car resting on the central portion of the tire's contact surface
When the wear occurs at the outer edges of the tire, the load of the car rests on the outer edges as the contact patch increases due to the tire being under-inflated
Camber is the slope provided in road pavement to drain off water from the road
Roads with camber has a raised middle portion and wear due to camber includes outer-edge tread wear, inner-edge tread wear and tire feathering
Answer is True.. hope I helped... pls mark brainliest
