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12 | An aircraft flies along a horizontal circle of radius 10 km with a constant speed of

155 m s–1. What is the angle between its wings and the horizontal?

wings of

aircraft

|

| A | 14 | B | 22 | C | 68 | D | 76 |

| | | | | | | | |

RVHS

10 The maximum safe speed of a car rounding an unbanked corner of radius 50 m is 20 ms−1.

If the road is banked at an angle θ to the horizontal, no frictional force is required for the car to turn round the banked road with the same speed and turning radius.

What is the fractional change in the normal reaction force on the car?

A 0.29 B 1.29 C 11.8 D 12.8

PJC

10 In a ride at an entertainment park, a person sits in a cage which moves in a vertical circle at a constant speed.

At the instant shown, what is the direction of the force exerted by the cage on the person?

D

C

B

A

SAJC

10 | Singapore is on the Equator. Seoul is at a latitude of 37.50 N as depicted in the diagram below.Singapore

Seoul

37.50

The centripetal acceleration at Singapore due to the Earth’s rotation about its axis is . The centripetal acceleration at Seoul due to the Earth’s rotation about its axis is . What is the ratio ? |

| A | 0.79 | B | 1.00 | C | 1.26 | D | 9.81 |

| | | | | | | | |

12 | A particle of mass m performs vertical circular motion as show in the diagram below.C

m

A

B

The following two graphs show the vertical and horizontal components of the velocity of the particle along path ABC.Calculate the centripetal acceleration at point C. |

| A | zero | B | | C | | D | |

MJC

11 A train travels with uniform speed on a curved horizontal track. The centre of curvature of the curve is at O. Which of the arrows represents a possible direction for the resultant force exerted by the track on the...