Quiz 31

decreases.

A blood platelet drifts along with the flow of blood through an artery that is partially blocked by deposits. As the platelet moves from the narrow region to the wider region, its speed increases. decreases. remains the same.

The flow rate is the same in both parts.

Blood flows through a coronary artery that is partially blocked by deposits along the artery wall. Through which part of the artery is the flow rate (volume of blood per unit time) largest? The narrow part. The wide part. The flow rate is the same in both parts.

there is a pressure difference across an object in a fluid.

Buoyant forces occur because pressure always pushes objects up. the pressure is equal everywhere in a fluid. there is a pressure difference across an object in a fluid. all of the pressures on an object cancel.

moves upwards.

Consider an object that floats in water but sinks in oil. When the object floats in water, half of it is submerged. If we slowly pour oil on top of the water so it completely covers the object, the object stays in the same place. moves upwards. sinks further in the water.

True

Smoke rises up a chimney partly because of Bernoulli's principle. True False

The two glasses weigh the same.

Two identical glasses are filled to the same level with water. One of the two glasses has ice cubes floating in it. Which weighs more? The glass with the ice cubes. The glass without the ice cubes. The two glasses weigh the same.

The flow speed increases as the diameter decreases because the same amount of mass that enters from the large pipe must exit from the smaller pipe.

Which of the following scenarios accurately describes the flow of an incompressible fluid through a pipe with a length of 10 feet and diameter of 2 inches to a pipe with a length of 10 feet and diameter of 1 inch? The flow speed decreases as the diameter decreases because the same amount of mass that enters from the large pipe must exit from the smaller pipe. The flow speed decreases as the diameter decreases because the not all of the water that enters from the large pipe can exit from the smaller pipe. The flow speed increases as the diameter decreases because the same amount of mass that enters from the large pipe must exit from the smaller pipe. The flow speed has to stay the same because the pipes have the same lengths.

The density of the object that sinks must be larger than the density of the object that floats.

You have two solid cubes of material. The cubes are not the same size. When you put them in a container with water, one floats and the other sinks. Which of the following statements is true? The density of the object that sinks must be larger than the density of the object that floats. The mass of the object that sinks must be larger than the mass of the object that floats. The density of the object that sinks must be smaller than the density of the object that floats. The volume of the object that sinks must be larger than the volume of the object that floats