Chapter 63 Is this a multiple-choice question?
"Then what are the units of measurement?" Qin Shang continued to ask.
"Well..."
Shen Buli hesitated a little. She really didn't record this specifically. She clearly remembered that it was written in the book, but she just couldn't remember it now.
Seeing Shen Buli's hesitant look, Qin Shang already understood. He didn't force her to answer. Seeing that she couldn't answer, he told her himself: "In this formula, each of them The unit of quantity must be the international unit, not any unit.”
After listening to what Qin Shang said, Shen Buli suddenly understood and nodded immediately.
"You should know what international units are, right?" Qin Shang asked again.
This Shen Buli really knew, so he nodded: "I know."
International units This is the most basic knowledge point. Qin Shang believed that Shen Buli knew it, so he did not ask any more questions and continued to talk about the topic.
"Let's look at this option B. The acceleration at a certain moment is only determined by the combined external force at that moment, and has nothing to do with the forces before or after. This statement is correct. Look at this formula, a=F combined /m, according to this formula, when the resultant force changes, its acceleration will also change, so the acceleration at a certain moment can only be determined by the external force at this moment.”
Qin Shang focused on key words when explaining the topic to Shen Buli, so that she could remember the key points more firmly.
Shen Buli acted like a good girl now. She listened attentively to everything Qin Shang said and nodded beside her.
"There is also the CD option, which can be seen based on a=F combined/m. a is equal to the ratio of the net force acting on the object and the mass. It can also be said to be the vector sum of the acceleration generated by each force, so C is also correct, as for option D..."
"Wait, wait."
Qin Shang was still talking and preparing to tell her option D, but Shen Buli suddenly interrupted him.
Qin Shang turned to look at her and said "Huh?" in confusion.
"You mean this is a multiple-choice question? Both B and C are correct?" Shen Buli opened his eyes wide, not believing it.
"Yes, this is a multiple-choice question." Qin Shang nodded and admitted.
"Are there any multiple-choice questions later?" Shen Buli asked again.
Qin Shang continued to nod: "Most of the following are multiple-choice questions."
When he heard that most of the following questions were multiple-choice questions, Shen Buli became a little excited: "Then why didn't you tell me earlier!"
You must know that she treated them as multiple-choice questions, otherwise she would not only write one answer.
No wonder she always felt that several answers to the following questions were correct, but it wasn't written in front of the question that it was multiple choice, so she picked the option she thought was the most correct.
I'm glad it turns out there are multiple-choice questions!
"This..." Qin Shang hesitated when Shen Buli asked.
This seems to be his mistake. He forgot about it when he was sorting out the questions.
However, Qin Shang resolutely refused to admit his mistake, so he said very shamelessly: "You should know even if I don't tell you. This is the most basic. Besides, even if I tell you that you have multiple choices, you should choose from Starting from A, this question is already wrong. It is a multiple-choice question. You can choose less but not the wrong choice. You should be very clear about this. ”
"This, this..." Shen Buli, who was still confident at first, immediately weakened when Qin Shang said this. She pursed her lips, blinked her eyes twice, and directly ignored the topic: " Talk about the topic, then talk about the topic." (End of this chapter)