# AP (Advanced Placement) Physics(B-C): Questions 56 - 58 of 921

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## Question number: 56

» Gravitation and Circular Motion

### Question

A car goes around a curve of radius with a constant speed . Then it goes around another curve of radius with speed . What is the centripetal acceleration on the car as it goes around the second curve, compared to the first?

### Choices

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

a. | The acceleration cannot be determined without knowing the mass of the car. | |

b. | Twice | |

c. | The same | |

d. | Four times | |

e. | All of the above |

## Question number: 57

### Question

A ladder has a mass of and length of . As shown in the illustration, the ladder remains stable against a frictionless wall with its bottom end 1 m from the base of the wall. Rank the following: the weight of the ladder , the normal force of the wall on the ladder the normal force of the floor on the ladder and the friction force of the floor on the ladder .

### Choices

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

a. |
| |

b. |
| |

c. |
| |

d. |
| |

e. | All of the above |

## Question number: 58

### Question

Four charged particles: two of charge and two of charge are placed at the vertices of a square of length *a*. The two positive charges are placed at opposite vertices, and the two negative charges are placed at opposite vertices. What is the net electric field at the center of the square due to the four charges?

### Choices

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

a. |
| |

b. | 0 | |

c. |
| |

d. |
| |

e. | None of the above |