# AP (Advanced Placement) Physics(B-C): Questions 283 - 286 of 921

Access detailed explanations (illustrated with images and videos) to **921** questions. Access all new questions- tracking exam pattern and syllabus changes. View the complete topic-wise distribution of questions. *Unlimited Access for Unlimited Time*!

View Sample Explanation or View Features.

Rs. 450.00 or

How to register?

## Question number: 283

### Question

The speed of air moving over the top of a thin airfoil, such as an airplane wing, is , and the speed of air moving under the airfoil is . If the area of surface is approximately , what is the lift force on the airfoil due to the moving air?

(Assume the density of air is . )

### Choices

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

a. |
| |

b. |
| |

c. |
| |

d. |
| |

e. | None of the above |

## Question number: 284

### Question

The circuit in the diagram shows five identical lightbulbs connected to a battery. If each bulb has a resistance of , find the equivalent (total) resistance of the five bulbs.

### Choices

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

a. |
| |

b. |
| |

c. |
| |

d. |
| |

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

## Question number: 285

### Question

A metal ruler is made of a material that has a coefficient of linear expansion of . If the ruler is heated from to , by what percentage does the length of one centimeter on the ruler increase?

### Choices

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

a. | Less than | |

b. | Between and | |

c. | About | |

d. | Between and | |

e. | None of the above |

## Question number: 286

### Question

The graph displays data for a force applied to a spring. How much work is done on the spring by the applied force in extending the spring a distance of ?

### Choices

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

a. |
| |

b. | The work cannot be determined without knowing the elastic constant of the spring. | |

c. |
| |

d. |
| |

e. | None of the above |