HESI Physics Questions with Answers and Explanations

HESI Physics Questions with Answers and Explanations 1. When a junked car is compacted, which statement is true? A. Its mass increases. B. Its mass decreases. C. Its density increases. D. Its density decreases. Explanation: Since density = mass/volume, it should be obvious that the decrease in volume as a car is crushed should lead to an increase in density. Nothing happens to change the mass of the car. 2. A car travels 3 miles north, 6 miles south, 2 miles east, 2 miles west, and then 3 miles north. Which of the following is true? A. The displacement of the car is 16 miles, and the distance traveled is 0 miles. B. The displacement of the car is 16 miles, and the distance traveled is 16 miles. C. The displacement of the car is 0 miles, and the distance traveled is 0 miles. D. The displacement of the car is 0 miles, and the distance traveled is 16 miles. Expalanation: If a car travels 3 miles north, 6 miles south, 2 miles east, 2 miles west, and then 3 miles north, it has traveled a total distance of 16 miles. However, because of the directions it has traveled, it has ended up in the place where it started, giving it a displacement of 0. 3. Why doesn’t a raindrop accelerate as it approaches the ground? A. Gravity pulls it down at a constant rate. B. Air resistance counteracts the gravitational force. C. Its mass decreases, decreasing its speed. D. Objects in motion decelerate over distance.