# AP (Advanced Placement) Physics(B-C): Questions 851 - 855 of 921

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## Question number: 851

» Gravitation and Circular Motion

### Question

Student is given a ball of mass attached to a string of length and told to whirl the ball on the string in a vertical circle so that its velocity at the top is at a minimum. What is the approximately minimum speed at the top?

### Choices

Choice (5) | Response | |
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a. |
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b. |
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c. |
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d. |
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e. | None of the above |

## Question number: 852

### Question

What must have been frequency of the photon, when a Hydrogen atom initially in its first excited state, absorbs a photon and ends up in level?

### Choices

Choice (5) | Response | |
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e. | All of the above |

## Question number: 853

» Periodic Motion, Mechanical Waves & Sound

### Question

A mass oscillates on a spring with a period of and an amplitude of . Which of the following equations describes the position of the oscillating mass as a function of time?

### Choices

Choice (5) | Response | |
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e. | Question does not provide sufficient data or is vague |

## Question number: 854

» Kinematics in One and Two Dimensions

### Question

Quantities in everyday applications often have the prefixes *Giga-* and *pico-*. How many pico – meters ( ) are equivalent to one Giga – meter ?

### Choices

Choice (5) | Response | |
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a. |
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e. | None of the above |

## Question number: 855

### Question

An object is placed from a convex lens whose focal length is . The image distance is ________ .

### Choices

Choice (5) | Response | |
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a. |
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b. |
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c. | 12.12 cm | |

d. |
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e. | Question does not provide sufficient data or is vague |