How does the buoyant force on a submerged object compare with the weight of the water displaced? * 1 point the buoyant force is greater than the weight of the water displaced. the buoyant force is equal to the weight of the water displaced. both are zero. the buoyant force is less than the weight of the water displaced. how is lift produced on the wing of an airplane? * 1 point faster airflow does not change the pressure over the wing - it remains at atmospheric pressure. the speed increases as the air flows over the wing, so the pressure decreases. high-speed air creates higher air pressure over the wing. high-speed air creates lower pressure over the wing only as it slows down after passing the high point of the wing. what happens to the internal pressure in a fluid flowing in a horizontal pipe when its speed increases? * 1 point the pressure is independent of the speed. the pressure does not change when the speed increases. the pressure decreases when the speed increases. the pressure increases when the speed increases. if an object suspended by a scale shows a weight of 3 n in air, and 2 n when submerged in water, the buoyant force on the submerged object is . * 1 point 3 n more than 3 n 1 n 2 n how does the volume of a completely submerged object compare with the volume of water displaced? * 1 point the volume of the submerged object is greater than the volume of displaced water. the volumes of both add to zero. the volumes are equal. the volume of the submerged object is less than the volume of displaced water. a helium-filled balloon will reach its maximum altitude when . * 1 point it displaces a greater weight of air than its own weight. its weight equals the weight of displaced air it can no longer displace its own weight of air its density exceeds that of the surrounding air the buoyant force on a floating object is __. * 1 point less than the object's weight equal to the object's weight equal to the object's volume more than the buoyant force than if submerged?

Question

09-06-2018
Physics

contestada

How does the buoyant force on a submerged object compare with the weight of the water displaced? * 1 point the buoyant force is greater than the weight of the water displaced. the buoyant force is equal to the weight of the water displaced. both are zero. the buoyant force is less than the weight of the water displaced. how is lift produced on the wing of an airplane? * 1 point faster airflow does not change the pressure over the wing - it remains at atmospheric pressure. the speed increases as the air flows over the wing, so the pressure decreases. high-speed air creates higher air pressure over the wing. high-speed air creates lower pressure over the wing only as it slows down after passing the high point of the wing. what happens to the internal pressure in a fluid flowing in a horizontal pipe when its speed increases? * 1 point the pressure is independent of the speed. the pressure does not change when the speed increases. the pressure decreases when the speed increases. the pressure increases when the speed increases. if an object suspended by a scale shows a weight of 3 n in air, and 2 n when submerged in water, the buoyant force on the submerged object is . * 1 point 3 n more than 3 n 1 n 2 n how does the volume of a completely submerged object compare with the volume of water displaced? * 1 point the volume of the submerged object is greater than the volume of displaced water. the volumes of both add to zero. the volumes are equal. the volume of the submerged object is less than the volume of displaced water. a helium-filled balloon will reach its maximum altitude when . * 1 point it displaces a greater weight of air than its own weight. its weight equals the weight of displaced air it can no longer displace its own weight of air its density exceeds that of the surrounding air the buoyant force on a floating object is __. * 1 point less than the object's weight equal to the object's weight equal to the object's volume more than the buoyant force than if submerged?

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skyluke89 skyluke89 · Answer 1 · 2018-06-19T09:41:51+02:00

1) How does the buoyant force on a submerged object compare with the weight of the water displaced?
Answer: the buoyant force is equal to the weight of the water displaced.

In fact, the buoyant force is exactly defined as the weight of the water displaced:
[tex]B=\rho_L V_L g[/tex]
where [tex]\rho_L[/tex] is the density of the liquid, [tex]V_L[/tex] is the volume of liquid displaced, g is the gravitational acceleration.

2) how is lift produced on the wing of an airplane?
Answer: the speed increases as the air flows over the wing, so the pressure decreases.

Indeed: given the shape of the wing, the speed of the air flow over the wing increases. This effect produces a lower pressure over the wing than the pressure below the wing, according to Bernoulli's equation:
[tex]p+ \frac{1}{2}\rho v^2 = cost.[/tex]
where p is the pressure, [tex]\rho[/tex] is the fluid density and v the speed. As we see fro mthe equation, the larger the speed, the lower the pressure, and this difference in pressure between below and over the wing generates the lift.

3) what happens to the internal pressure in a fluid flowing in a horizontal pipe when its speed increases?
Answer: the pressure decreases when the speed increases

As before, this is a direct consequence of Bernoulli's equation:
[tex]p+ \frac{1}{2}\rho v^2 = cost.[/tex]
where p is the pressure, [tex]\rho[/tex] is the fluid density and v the speed. From the formula, we see that when the speed increases, the pressure decreases.

4) if an object suspended by a scale shows a weight of 3 n in air, and 2 n when submerged in water, the buoyant force on the submerged object is:
Answer: 1 N

The weight shown by the scale is the difference between the real weight of the object (pointing downward) and the buoyant force (pointing upward). Since the real weight is 3 N (in air), and the apparent weight in water is 2 N, the buoyant force must be
[tex]B=3 N-2 N=1 N[/tex]

5) how does the volume of a completely submerged object compare with the volume of water displaced?
Answer: the volumes are equal

Indeed: when the object is completely submerged, the volume of water displaced is exactly equal to the volume of the object.

6) a helium-filled balloon will reach its maximum altitude when __________.
Answer: its weight equals the weight of displaced air.

In fact, when the weight of the balloon becomes equal to the weight of the displaced air, the weight of the object (pointing downward) becomes equal to the buoyant force (pointing upward), so the balloon is in equilibrium and it no longer moves.

7) the buoyant force on a floating object is __________.
Answer: equal to the object's weight

Exactly: since the object is floating, it must be in equilibrium. This means that the buoyant force on the object is exactly equal to the weight of the object.