What happens when a vector is multiplied by a real number?

A helicopter flies off, its propellers rotating. Why doesn't the body of the helicopter rotate in the opposite direction?

A solid tied at the end of a string is revolved in vertical. At what point the tension in the string will be the greatest?

1) At the top

2) At the bottom

3) Half a way towards top

4) Half a way towards...

1. कमपयुटर परयोग भइरहेको कूनै दुई कषेतरहरूको नाम लेखनुहोस ।
2. डिजिटल साकषरता भननाले के बुझिनछ ?
3. सूचना तथा सञचार परविधि भनेको के हो ? 
4. कमपयुटर हारडवेयरलाई उदाहरणसहित वरगीकरण गरनुहोस ।
5. कमपयुटरको परयोग आज...