1. The gravitational acceleration on the surface of Earth is 9.8 m/s2 . What wou

Question

1. The gravitational acceleration on the surface of Earth is 9.8 m/s2 . What would the gravitational acceleration on Earth's surface be if its radius is doubled while its mass remains the same. (a) 19.6 m/s2 (b) 9.8 m/s2 (c) 4.9 m/s2 (d) 2.45 m/s2

2. As a block slides down a frictionless incline, which of the following statements is true? (Neglect air resistance. There are no additional external forces acting on the block.) (a) Its speed increases and its acceleration remains constant. (b) Both its speed and acceleration increase. (c) Its speed and acceleration remain constant. (d) Its speed increases and its acceleration decreases.

Explanation / Answer

1.acceleration due to gravity is given by G*Me / r^2. so doubling the radii makes it one fourth.so answer is 2.45m/s2.

2. when the block is moving downwards a incline, the force acting on it i.e m*g*sin(theta) remains constant.so the acceleration remains constant. but since the acceleration is constant velocity increases. so a is correct

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