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Physics

2. A person is walking in downtown Chicago. He starts 7 blocks north and 3 blocks west of the city’s center. He then walks to a position of 12 blocks north and 1 block east of the city’s center. What was his displacement magnitude and direction?

Magnitude 16.2 blocks; direction -68.2 east of north
Magnitude 19.1 blocks; direction -6.01 east of north
Magnitude 6.40 blocks ; direction 51.3 east of north
Magnitude 6.40 blocks; direction 38.7 east of north(my guess)

4. On a map, a measurement of 1.0 cm represents a velocity of 100 m/s. If you were to draw a vector on the map that represents 80 m/s, how long would the vector be?
8.0 mm
8.0 cm(my guess)
1.25 mm
1.25 cm

5. The Vector -B(arrow on top —>) has a magnitude of 25 m and makes an angle of 30 degrees with the +x axis. Which is true about the vector B—>
It has the same direction as B—> but a magnitude of -25 m
It makes an angle of -30 degrees with the +x axis.
It has a magnitude of 25 m.
It has the opposite direction as B—> and a magnitude of -25 m(my guess)

Please help!

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Babygirl

  1. What?! I tried my best! No need to judge and be mean! I am not the best at physics I just needed someone to check over my answers. Where is the report button on here???

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    Babygirl

  2. First:
    No way Ms Sue posted that.
    Second:
    1.
    North 7+12 = 19
    East -3 + 1 = -2
    magnitude = sqrt (4+361) = sqrt 365 = 19.1
    That is really all you need
    however You are west of north
    tan angle w of n = 2/19 =.105
    so angle = 6 degrees west of n (which is -6 east of n :)

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    Damon

  4. Thanks Damon! Can you help with the others?

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    Babygirl

  5. 4. On a map, a measurement of 1.0 cm represents a velocity of 100 m/s. If you were to draw a vector on the map that represents 80 m/s, how long would the vector be?
    8.0 mm
    8.0 cm(my guess)
    1.25 mm
    1.25 cm
    =================
    no way
    1 cm * 80/100 = 0.8 cm which is 8 mm

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    Damon

  6. Is the last one correct?

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    Babygirl

  8. 5. The Vector -B(arrow on top —>) has a magnitude of 25 m and makes an angle of 30 degrees with the +x axis. Which is true about the vector B—>
    It has the same direction as B—> but a magnitude of -25 m
    It makes an angle of -30 degrees with the +x axis.
    It has a magnitude of 25 m.
    It has the opposite direction as B—> and a magnitude of -25 m(my guess)
    =================
    opposite direction but SAME SIZE (magnitude)
    30 degrees + 180 degrees = 210 degrees :)

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    Damon

  9. nope, see above :)

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    Damon

  10. 2 was the last option and 5 was the third option

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    Babygirl

  12. By the way 210 degrees from +x axis is -30 from -x axis
    =============
    It has a magnitude of 25 m

    Is the only one I agree with but check for typos.

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    Damon

  13. your second one, (4) is 8 millimeters which is 0.8 cm which is first on your list of choices. It has to be LESS than a centimeter.

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    Damon

  14. I've deleted the fake post and banned that person. I don't understand why people feel the need to post idiocy like that.

    Sorry, Babygirl.

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    Writeacher

  16. Thank you Damon and Writeacher! I really appreciate it!

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    Babygirl

  17. You're welcome!

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    Writeacher

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