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Can an object reverse its direction of travel while maintaining a constant acceleration

Each questions needs to be 100 words and there are 20 questions.

Questions:
1. Can an object reverse its direction of travel while maintaining a constant acceleration? If so, cite an example. If not, provide an explanation.

2. Can an automobile with a velocity toward the north simultaneously have an acceleration towards the south? Please explain your answer.

3. You toss a ball straight up with an initial speed of 20m/s. How much time does it take to reach its maximum height (ignoring air resistance)?

4. A car slows down from 28 m/s to rest in a distance of 88m. What was its acceleration, assumed constant?

5. Suppose that you jounce up and down while weighing yourself on a bathroom scale. Which varies: the upward support force or the force of gravity on you? Why is your weight reading best shown when you stand at rest on the scale?

6. A crater remains at rest on a factory floor while you push on it with 100 N of horizontal force. What is the friction force exerted on the crate by the floor? Please explain your answer.

7. If a lorry and a car have a head-on collision, upon which vehicle is the impact force greater? Which vehicle experiences the greater deceleration? Please explain your answer.

8. Why must you bend forward when carrying a heavy load on your back?

9. One man is twice as tall as another man. Assume that they are completely similar in other characteristics of their body and doing exactly the same stationary gymnastic maneuver. Are they subjected to the same stresses in their bones and muscles? Explain your answer.

10. If an elderly person with osteoporosis falls and is then diagnosed with a broken hip, in what way could the osteoporosis have contributed to the breaking?

11. Are you slightly longer while lying down than you are tall when you are standing up? Please explain your answer.

12. The mechanical properties of bone material are anisotropic. Please use examples to explain what this means.

13. If an erect person’s systolic pressure is measured at 120 mm-Hg at the level of heart, please calculate the arterial systolic blood pressure in the feet of this person (in the unit of mm-Hg). Assume that the heart is 130 cm above the feet (the density of blood is 1050 kg/m3), and 1 mm-Hg = 133 N/m2

14. When you are standing, blood pressure in your legs is greater than in your upper body. Would this be true for an astronaut in orbit? Defend your answer.

15. Why bodies float higher in saltwater than in fresh water?

16. Computer the average velocity of the blood in the aorta of radius 1cm if the flow rate is 5 litre/min.

17. If the speed of a wave doubles while the frequency remains the same, what happens to the wavelength? Please explain your answer.

18. When you blow your horn while driving toward a stationary listener, the listener hears an increase in the frequency of the horn. Would the listener hear an increase in the horn frequency if he or she were also in a car traveling at the same speed in the same direction as you are? Please explain your answer.

19. If the speed of sound were dependent on its frequency, would you enjoy a concert sitting in the second balcony? Please explain your answer.

20. A cat can hear sound frequencies up to 70,000 Hz. Bats send and receive ultra-high-frequency squeaks up to 120,000 Hz. Which hears sound of shorter wavelengths: cats or bats. Please explain your answer.



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