Answer:
HUMAN DEVELOPMENT
MOTOR BEHAVIOR
EXERCISE SCIENCE
MEASUREMENT AND EVALUATION
HISTORY AND PHILOSOPHY
UNIQUE ATTRIBUTES OF LEARNERS
CURRICULUM THEORY AND DEVELOPMENT
Explanation:
Answer:
The maximum length of a surface flaw is 8.24 μm
8.24 μm
Explanation:
Given that:
The modulus of elasticity E = 69 GPa
The specific surface energy
= 0.3 J/m²
The length of the surface flaw "a" = ??
From the theory of the brittle fracture;

Making a the subject of the formula; we have:


a = 8.24 × 10⁻⁶ m
a = 8.24 μm
Thus; the maximum length of a surface flaw is 8.24 μm
Answer:
The major effects of ice accretion on the aircraft is that it disturbs the flow of air and effects the aircraft's performance.
Explanation:
The ice accretion effects the longitudinal stability of an aircraft as:
1. The accumulation of ice on the tail of an aircraft results in the reduction the longitudinal stability and the elevator's efficacy.
2. When the flap is deflected at
with no power there is an increase in the longitudinal velocity.
3. When the angle of attack is higher close to the stall where separation occurs in the early stages of flow, the effect of ice accretion are of importance.
4. When the situation involves no flap at reduced power setting results in the decrease in aircraft's longitudinal stability an increase in change in coefficient of pitching moment with attack angle.
Answer:
True strain = 3.7704
Explanation:
Strain is the measure an object that is stretched or deformed. This occurs when a force is applied to an object. Strain deals mostly with the change in length of the object. Strain = Δ L /L = Change in Length over the original Length:
Volume Constancy :
ΔL/L0=A0/ΔA=(D0/ ΔD)=(25mm/0.75mm)^2
ΔL/L0=44.4
Engineering strain:
Engineering strain =ΔL-L0/L0=ΔL/L0-1
Engineering strain =44.4-1=43.4
True strain, ε=In(ΔL/L0)=In(43.4)=3.7704
Note that strain has no unit, so the True strain = 3.7704