Q3. The earth moves around the sun at approximately \( 30 \mathrm{~m} / \mathrm{s} \). Is the earth accelerating? A. No, because acceleration is a vector. B. No, because the net displacement is zero. C. Yes, because the speed is not constant. D. Yes, because the velocity is not constant. Q4. All of the following describe the magnitude and direction of a vector EXCEPT: A. \( 10 \mathrm{~m} / \mathrm{s} \) West B. \( 10 \mathrm{~m} / \mathrm{s} \) in a circle C. 20 m to the left D. 20 m straight up

**Q3.** The Earth moves around the sun at approximately \( 30 \mathrm{~m/s} \). Is the Earth accelerating? The correct answer is: **D. Yes, because the velocity is not constant.** Explanation: Although the speed of the Earth is constant at \( 30 \mathrm{~m/s} \), its direction is continuously changing as it orbits the sun. Since acceleration is defined as a change in velocity (which includes both speed and direction), the Earth is indeed accelerating. --- **Q4.** All of the following describe the magnitude and direction of a vector EXCEPT: The correct answer is: **B. \( 10 \mathrm{~m/s} \) in a circle.** Explanation: While options A, C, and D provide clear directional information (West, to the left, straight up), option B describes a motion that is circular, which does not specify a single direction. A vector must have a specific direction, and "in a circle" does not provide a clear directional component.