star227
Oct17-04, 06:27 PM
Okay i dont have the best physics teacher :-/ he often gets confused with what he's teaching and shows us the wrong thing...We have four problems for homework and I would just like one of you experts to check over it ;)
1. A car is driven 125 km due west, then 65 km due south. What is the magnitude of displacement? R^2=a^2 + b^2
R^2=125^2 + 65^2
R^2=19850
R=140.9 (about)
2. A shopper walks from the door of the mall to her car 250m down a lnae of cars, then turns 90 degrees to the right and walks an additional 60m. What is the magnitude of the displacement of her car from the mall door?
R^2=a^2 + b^2
R^2=60^2 + 250^2
R^2=66100
R=257.1 (about)
3. A hiker walks 4.5 km in one direction, then makes a 45 degree turn to the right and walks another 6.4 km. What is the magnitude of her displacement?
R^2= a^2 + b^2 - 2ab COS(angle)
R^2= 4.5^2 + 6.4 ^2 -2(4.5)(6.4)cos45
R^2=20.25 + 40.96- 40.729
R^2=20.481
R=4.526 (about)
4. What is the magnitude of your displacement when you follow directions that tell you to walk 225 m in one direction, make a 90 degree turn to the left and walk 350 m, then make a 30 degree turn to the right and walk 125 m?
I'm not sure how to go about doing this one but what I DO know is
how the triangle looks and the angle measurements. I'm just not
sure what it is I'm supposed to be writing down. A hand plz lol?
1. A car is driven 125 km due west, then 65 km due south. What is the magnitude of displacement? R^2=a^2 + b^2
R^2=125^2 + 65^2
R^2=19850
R=140.9 (about)
2. A shopper walks from the door of the mall to her car 250m down a lnae of cars, then turns 90 degrees to the right and walks an additional 60m. What is the magnitude of the displacement of her car from the mall door?
R^2=a^2 + b^2
R^2=60^2 + 250^2
R^2=66100
R=257.1 (about)
3. A hiker walks 4.5 km in one direction, then makes a 45 degree turn to the right and walks another 6.4 km. What is the magnitude of her displacement?
R^2= a^2 + b^2 - 2ab COS(angle)
R^2= 4.5^2 + 6.4 ^2 -2(4.5)(6.4)cos45
R^2=20.25 + 40.96- 40.729
R^2=20.481
R=4.526 (about)
4. What is the magnitude of your displacement when you follow directions that tell you to walk 225 m in one direction, make a 90 degree turn to the left and walk 350 m, then make a 30 degree turn to the right and walk 125 m?
I'm not sure how to go about doing this one but what I DO know is
how the triangle looks and the angle measurements. I'm just not
sure what it is I'm supposed to be writing down. A hand plz lol?