# Kinematics (NEET Physics): Questions 77 - 81 of 229

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## Question number: 77

» Kinematics » Motion in a Straight Line

### Question

A metal sphere is hung by a string fixed to a wall. The sphere is pushed away from the wall by a stick. The forces acting on the sphere are shown in the second diagram. Which of the following statements is wrong?

In above fig we shows that metal sphere fixed at the wall, as we apply some force on it then motion is taking place, here angle is .

### Choices

Choice (4) | Response | |
---|---|---|

a. | + + = 0 | |

b. | T | |

c. | T | |

d. | p = w |

## Question number: 78

» Kinematics » Scalars and Vectors » Scalar and Vector Products

### Question

the vector P = ai + aj + 3k and Q = ai - 2j - k are perpendicular to each other. The positive value of a is

### Choices

Choice (4) | Response | |
---|---|---|

a. | 4 | |

b. | 9 | |

c. | 3 | |

d. | 13 |

## Question number: 79

» Kinematics » Scalars and Vectors » Scalar and Vector Products

### Question

A particle moves from position 3i + 2j-6k to 14i + 13j + 9k due to a uniform force of (4i + j + 3k) N. If the displacement in metres then work done will be

### Choices

Choice (4) | Response | |
---|---|---|

a. | 250 J | |

b. | 300 J | |

c. | 100 J | |

d. | 200 J |

## Question number: 80

» Kinematics » Scalars and Vectors » Scalar and Vector Products

### Question

If|AxB|=| A. B| , then angle between A and S will be

### Choices

Choice (4) | Response | |
---|---|---|

a. | 30 | |

b. |
60° | |

c. |
45° | |

d. | None of the above |

## Passage

A particle moves along x-axis and its acceleration at any time t is a = 2 sin (πt), where t is in seconds and a is in m/s ^{2}. The initial velocity of particle (at time t = 0) is u = 0.

## Question number: 81 (1 of 3 Based on Passage) Show Passage

» Kinematics » Motion in a Straight Line

### Question

The distance travelled (in meters) by the particle from time t = 0 to t = t will be –

### Choices

Choice (4) | Response | |
---|---|---|

a. | - + | |

b. | - | |

c. |
| |

d. | All of the above |