A car travels around a curve with constant speed. The correct statement from the

Question

A car travels around a curve with constant speed. The correct statement from the following the car has an acceleration directed inward toward the center of the curve. the velocity of the car is constant. the car has an acceleration directed outward from the center of the curve. the car has zero acceleration. the car has an acceleration directed in the instantaneous direction of the velocity vector. A ball is whirled on the end of a string in a horizontal circle at constant speed. Suddenly, the string breaks. Immediately after the string breaks, the ball will have a horizontal velocity away from the center of the circle. have a horizontal velocity is tangential to the circle. have a horizontal velocity toward the center of the circle. have a horizontal velocity partly in away from the center of the circle and partly tangent to the circle. have no horizontal velocity. On a two-lane highway (not divided), a car headed north experiences a centripetal acceleration directed toward the west. Simultaneously, a truck passes the car, headed south in the other lane. The direction of the centripetal acceleration on the truck is west. east. north. south. In order to move in a perfectly circular path, the net force on an object must always change magnitude but not direction. always change direction but not magnitude. always change both magnitude and direction. have a constant magnitude and direction. equal zero. If work was done on an object, the object must have changed only its direction of motion. accelerated. experienced a frictional force. changed its position.

Explanation / Answer

21.- If the car is moving in a curved trajectory it needs to have a centripetal acceleration, an acceleration that points to the radial center of the trajectory (A correct and C incorrect). That means that the acceleration is not zero (D incorrect) and the velocity (not the speed; the vectorial quantity!) is changing at each point (B incorrect). The speed is constant, then thereis no acceleration pointing in the same direction that the velocity.

22.- When the string is break, in the ball there is no centripetal force exerted on it and then velocity, that is allways tangential to the circle, remains with the same direction. Therefore the ball has horizontal velocity tangential to the circle (only B is correct)

I can gladly help you with the other questions, but you should post it in a new question.

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