1. These images show cars in wind tunnels which are injected with smoke particle
ID: 2040091 • Letter: 1
Question
1. These images show cars in wind tunnels which are injected with smoke particles so the path of air particles is visible. Which of the image(s) is/are an example of laminar flow both in front of and behind the cars?
2. As a fluid moves through a tube with changing diameter, which of the following is constant at different parts of the tube during a given period of time?
a. The amount of mass that flows through each section.
b. The velocity (the velocity in all sections is equal).
c. The cross-sectional area of the tube
d. The density of the fluid
3. Bernoulli’s equation is a statement of what general physics principle (applied to moving fluids)?
a. Newton’s 3rd Law
b. conservation of energy
c. conservation of momentum
d. Newton’s 2nd Law of rotation
4. Two balloons are tied and hang with their nearest edges about 3cm apart. If you blow between the balloons (not at the balloons, but at the opening between them), what happens? Why?
a. The force from your breath pushes the balloons together
b. The force from your breath pushes the balloons apart
c. The force from your breath pushes out the air between the balloons, creating a low-pressure area that pulls the balloons together.
d. The force from your breath pushes out the air between the balloons, creating a high-pressure area that pushes the balloons apart.
5. As water in a level pipe passes from a narrow cross section of pipe to a wider cross section, how does the pressure against the wall change?
a. it increases
b. it decreases
c. it does not change
Explanation / Answer
1)
correct option is B,
image of car(B) is an example of laminar flow
2)
correct option is d
the density of the fluid is same
3)
correct option is b
Bernoulli's equation is based on the conservation of energy
4)
the correct option is c,
The force from your breath pushes out the air between the balloons, creating a low-pressure area that pulls the balloons together
5)
corect oprion is a,
pressure increases
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.