#27638609 · 1 Oct 2011, 22:16 · · პროფილი · პირადი მიმოწერა · ჩატი
შეგიძლიათ დამეხმაროთ ფიზიკის დავალების დაწერაში?
4. Can a vector of magnitude zero have a nonzero component?
5. Is it possible to have |A+B| = |A-B|? If so, illustrate with a diagram. Use both geometrical and algebraic approaches. (Hint: use scalar product formula)
6. If A-B= C-D, then does it means that A=C and B=D. Explain.
7. What can you conclude about the components of two planar vectors A and B, given (a) A=B; (b) A=B?
Problems
1. Given the three vectors A=i-4j, B=3i, C=-2j evаluate the following expressions if they are allowed mathematically: (a)C.(A+B);(b) C.(A.B);© C+(A.B);(d) C(A.B);(e) C(A.B);
2. A man walks 5m at 37o north of east and then 10m at 60o west of north. What is the magnitude and direction of his net displacement?
3. A girl walks 3m east and then 10m south. What is her net displacement?
4. Find the scalar product of A=8i+2j-3k and B=3i-6j+4k
5. Find the angle between A=2i+j+2k and B=4i-3j (Hint: use scalar product formula)
Bonus
1. Please help your teacher, the Ministry of Food and Agriculture asked him: If a chicken-and-a-half can lay an egg-and-a-half in a day-and-a-half, how many days will it take two chickens to lay thirty-two eggs?
2. A 19th century British naturalist disposed towards to archaic units of measurement described a species of snail crawling at average speed of one furlong per fortnight. (A furlong is one eighth of 1 mile or 220 yards; a yard is 3feet or 0.9144 meter; a fortnight is a time interval of 14 days or 14 x 24 hours.) Recently, a biology student re-measured the snail's average speed and reported it as one centimeter per minute.
Which of the following is the most likely explanation of the difference between the two measurements? Hint: Use common sense.
1. The student got a much slower species of snail than the one described by the naturalist.
2. Pollution in action: the snails became somewhat slower than they used to be because of some environmental toxins.
3. The student's snails are crawling at exactly the same snail's pace they ever did, but he reported a slightly different value for their speed because he rounded it up in different units.
4. Evolution in action: even the snails got somewhat faster than they used to be.
5. The student had drunk too much beer and lost all sense of time; his measurements are garbage.
6. The student got a much faster species of snail than the one described by the naturalist.
დიდი მადლობა ვინც დამიწერს
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MacBook
2.5GHz Intel Core i5 Dual-Core
8GB of 1600MHz DDR3L RAM
128GB Flash Storage
Integrated Intel HD Graphics 4000
13.3" LED-Backlit IPS Retina Display
2560 x 1600 Native Resolution
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