An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
A current of 15.0 A for 30 seconds results in approximately 2.81 × 1 0 21 electrons flowing through the electric device. This is calculated by first determining the total charge and then converting that charge into the number of electrons. The charge of a single electron is 1.6 × 1 0 − 19 C .
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Let's break down each of the sentences and choose the correct words from the options given.
"Do you know ______ who swept the floor?"
The correct answer is know . The sentence asks if someone has knowledge about who swept the floor. The word "know" is a present tense verb that fits in this interrogative sentence structure.
"We must wash ______ our hands before eating."
The correct answer is wash . The sentence outlines an action that needs to be done (washing hands), and the word "wash" is the base form of the verb indicating this action.
"The doorbell is ringing. Will ______ you please open the door?"
The correct answer is you . This is a polite request asking if you or someone else can open the door.
"My father is working. We mustn't make any noise when we play."
The correct answer is mustn't . It shows prohibition or advice not to do something, indicating that making noise is not allowed.
"This shirt is very old. Shall I throw it away?"
The correct answer is Shall . It's a polite way to ask for advice or permission to do something, which in this case, is throwing away an old shirt.
