A dog is standing in the bed of a pickup truck. The bed is coated with ice, caus

Question

A dog is standing in the bed of a pickup truck. The bed is coated with ice, causing the force of friction between the dog and the truck to be zero. The truck is initially at rest, and then accelerates to the right, moving along a flat road. As seen from a stationary observer (watching the truck move to the right), the dog A) moves to the right at the same rate as the truck, so it doesn't slide. B) does not move left or right, but the back of the truck moves towards the dog. C) moves to the right, but not as quickly as the truck is moving to the right, causing it to slide towards the back of the truck. D) moves to the left, as the truck moves to the right, causing the dog to slide towards the back of the truck. Two objects have masses m and 5m, respectively. They both are placed side by side on a frictionless inclined plane and allowed to slide down from rest. A) The two objects reach the bottom of the incline at the same time. B) It takes the lighter object 5 times longer to reach the bottom of the incline than the heavier object. C) It takes the heavier object 5 times longer to reach the bottom of the incline than the lighter object. D) It lakes the lighter object 10 times longer to reach the bottom of the incline than the heavier object. E) It takes the heavier object 10 times longer to reach the bottom of the incline than the lighter object.

Explanation / Answer

5) Correct option is B. The reason being, the inertial force of the truck does not get transferred to the dog due to zero friction. Hence, the dog doesn't move with respect to the ground,but the back of the truck moves towards the dog

6) Correct option is A.The reason being the acceleration experienced by both the masss are equal and independent of their masses. Hence they will reach the bottom at the same time since they start at rest and travel the same magnitude of distance

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