Answer:
v₂ = 32.4 cm/s
Explanation:
From the continuity equation it is clear that:
Volume Flow Rate Before Plaque = Volume Flow Rate In Plaque
Q₁ = Q₂
A₁v₁ = A₂v₂
where,
A₁ = Area of artery before plaque build up = πd²/4 = π(1.1 cm)²/4 = 0.95 cm²
A₂ = Area of artery with plaque build up = πd²/4 = π(0.75 cm)²/4 = 0.44 cm²
v₁ = velocity of blood flow in artery before plaque region = 15 cm/s
v₂ = velocity of blood in artery in plaque region = ?
Therefore,
(0.95 cm²)(15 cm/s) = (0.44 cm²)(v₂)
v₂ = (14.25 cm³/s)/(0.44 cm²)
<u>v₂ = 32.4 cm/s</u>
Answer:
21.53 x 10^{6} N
Explanation:
force (F) = 4.71 x 10^{3} N
distance (s) = 4.57 km = 4570 m
how much work is done.
work = force x distance
work = 4.71 x 10^{3} x 4570 = 21.53 x 10^{6} N
Answer:
140 J
Explanation:
From the the question, the mass of the man =70.0 kg and the speed at which the man is walking =2.0 m/s.

where K.E = the kinetic energy, m=mass and v= speed.
By substitution,



Hence the kinetic energy of the man is 140J