# AP (Advanced Placement) Physics(B-C): Questions 409 - 410 of 920

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## Question number: 409

MCQ▾

### Question

Students are performing an experiment to determine the viscosities of various liquids by dropping a small metal sphere into graduated cylinders filled with the liquids, taking measurements, and then using the following equation to determine the viscosity of each liquid.

Where is viscosity, is the difference in densities between the sphere and the liquid, is , is the radius of the sphere, and is the speed of the sphere as it falls through the liquid. Water has a viscosity of and a density of , and olive oil has a viscosity of and a density of . The metal sphere has a radius of and a density of . How would the ball’s speed falling through water approximately compare to its speed falling through olive oil?

### Choices

Choice (5) Response

a.

The ball will fall about faster through water than through olive oil.

b.

The ball will fall about faster through water than through olive oil.

c.

The speed is about the same for each liquid.

d.

The ball will fall about faster through water than through olive oil.

e.

None of the above

## Question number: 410

MCQ▾

### Question

A string is stretched between two fixed points, and a standing wave of two complete loops is produced on the string using a frequency generator. Which of the following actions will produce a standing wave of three complete loops on the string?

### Choices

Choice (5) Response

a.

Decrease the frequency setting on the generator, keeping all other conditions the same.

b.

Replace the string with a thinner string of the same length and tension.

c.

Loosen the string to decrease the tension.

d.

Move the supports apart to increase the distance between the fixed points.

e.

All of the above