# AP (Advanced Placement) Physics(B-C): Questions 108 - 109 of 921

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## Question number: 108

» 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. Student is given a ball of mass attached, which is attached a string of length and told him to whirl the ball, such that its speed matches the minimum speed of the one held by student at the top of each ball’s motion. In order to do this, student must make sure that the string tension is:

### Choices

Choice (5) | Response | |
---|---|---|

a. | Twice the tension as the one held by Student | |

b. | It’s not possible under these conditions to match the velocities. | |

c. | Half the tension as the one held by Student | |

d. | The same as the one held by Student | |

e. | None of the above |

## Question number: 109

» Kinematics in One and Two Dimensions

### Question

Which of the following best describes the acceleration and velocity vectors for an air rocket fired straight upward from the ground, from the moment just after it leaves the ground until it hits the ground again? Assume that the upward direction is positive.

### Choices

Choice (5) | Response | |
---|---|---|

a. | The acceleration is always negative, and the velocity is always positive. | |

b. | The acceleration is always negative, and the velocity is positive on the way up and negative on the way down. | |

c. | The acceleration and velocity vectors are both positive on the way up and on the way down. | |

d. | The acceleration and velocity vectors are both positive on the way up and both negative on the way down. | |

e. | None of the above |