Question

英文物理高手们,帮我解答一下这些物理题吧,可否给出英文答案,急用!!谢谢大家了!

1. Name one situation where the acceleration of an object is in a different direction than the velocity of object.

2. If you are jumping, why is it a good idea to bend your knees when you land?(use impulse to explain)

3. The chemical compound SiCl₄ (one silicon atom bonded with four chlorine atoms) is a colorless liquid. Which of the following would you expect to have similar chemical properties, and why?
(A) SiBr₄(one silicon atom bonded with four bromine atoms);
(B) PCl₄(one silicon atom bonded with four tellurium atoms.)
这道题,能给翻译下吗,谢谢~

(4) An atom has 17 protons, 18 neutrons and 18 electrons. Write the element, mass number and ionization state( for example: ⁴He2⁺)

Answer 1

1、指出一种物体的加速度和速度方向不一致的情况。（答：曲线运动）
2、当你跳跃时，为什么着地的时候最好屈膝？（用冲量来解释）
3、化合物SiCl4（一个硅原子被四个 氯原子包围）是一种无色液体，你认为下列哪种物质具有与之相似的化学性质？为什么？
A) SiBr₄(一个硅原子被四个溴原子包围);
(B) PCl₄(一个磷原子被四个 氯原子包围）
4、一个原子有17个中子、18个质子和18个电子，写出它的化学符号、质量数和电离态（例如 ⁴He2⁺）