# AP (Advanced Placement) Physics(B-C): Questions 679 - 682 of 921

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## Question number: 679

### Question

Two objects of masses and are moving along the same straight line and direction with velocities of and , respectively. They collide and after the collision, the first object moves at a velocity of . What is the velocity after the collision of second object?

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

## Question number: 680

### Question

A latex balloon is charged up to . How many electrons are transferred in this process?

### Choices

Choice (5) | Response | |
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a. |
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b. |
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c. |
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d. | All of the above | |

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

## Question number: 681

### Question

A mixture of of water and of ice at is, in a reversible process, brought to a final equilibrium state where the water/ice ratio, by mass at . What is the entropy change of the system during this process?

(Latent heat of water is )

### 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. | All of the above |

## Question number: 682

» Magnetic Field & Electromagnetism

### Question

A coil having an axial length of and a radius of is pivoted in magnetic field having a flux density of . The current flowing through coil is . If the torque acting on the coil is , then how many number of turns of coil is there?

### Choices

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

a. | 250 | |

b. | 360 | |

c. | 300 | |

d. | 180 | |

e. | All of the above |