Question

question 3
the buoyant force on a submerged object is equal to the weight of the fluid that is displaced by the object. (2.b)
true
false
question 4
which was leonardo da vincis greatest contribution to modern aviation? (2.a)
a. he described flight similar to that of birds.
b. he designed and tested the airscrew.
c. he analyzed the four forces of flight.
d. he invented the modern - day jet engine.
question 5
what are the main parts of a hot air balloon? (2.b)
a. nylon, plastic, and gores
b. propellers, basket, and heat
c. bag, gondola, and propane
d. basket, burner, and envelope
question 6
______ is the ability or tendency to float in air, in water, or some other fluid. (2.b)
a. density
b. buoyancy
c. flotation
d. lift

Explanation:

• Question 3: This is based on Archimedes' principle which states the buoyant force on a submerged object equals the weight of the displaced fluid.
• Question 4: Leonardo da Vinci described flight similar to that of birds. He did not analyze the four forces of flight (which was done later by others), design and test the airscrew in the modern - sense, or invent the modern - day jet engine.
• Question 5: The main parts of a hot air balloon are the basket, burner, and envelope. Nylon and plastic are materials, propellers are not part of a hot air balloon, and bag and gondola are not the most common terms for its main parts compared to envelope and basket.
• Question 6: Buoyancy is defined as the ability or tendency to float in air, water, or other fluid. Density is mass per unit volume, flotation is the state of floating, and lift is a force in aerodynamics.

Answer:

Question 3: True
Question 4: a. He described flight similar to that of birds.
Question 5: d. Basket, burner, and envelope
Question 6: b. Buoyancy