How far does judy travel in 2 3/4 hours if she travels at the rate of 5 1/2 miles per hour
1 answer:
Judy travel's 15.125 miles or 15 miles in 2 3/4 hours
How to solve such time related questions?
The key concept for solving such questions is the relationship between speed, distance and time.
The relationship between them is Distance = Speed x Time
Given:
- Speed = 5 1/2 miles per hour
- Time = 2 3/4 hours
Substituting it in the relationship we get,
Distance = Speed x Time
Distance = 5 1/2 miles per hour x 2 3/4 hours
Distance = miles
Distance = miles or 15
miles
Thus Judy travel's 15.125 miles or 15 miles in 2 3/4 hours
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Answer:
Step-by-step explanation:
i. For navigation purposes, bearing is measured clockwise from north. In (x, y) coordinates, a distance D at a bearing B will have coordinates ...
(x, y) = (Dsin(B), Dcos(B))
Then 50 steps north (bearing 0°) will put James at coordinates ...
(x, y) = (50sin(0), 50cos(0)) = (0, 50)
The movement 25 steps west (bearing 270°) will add a displacement of ...
(x, y) = (25sin(270°), 25cos(270°)) = (-25, 0)
Finally, the movement of 50 steps on bearing 315° will add a displacement of ...
(x, y) = (50sin(315°), 50cos(315°)) = (-25√2, 25√2)
These movements are shown by the arrows to N, W, and F in the attached diagram.
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ii. James's final displacement is the sum of the individual displacements:
(0, 50) +(-25, 0) +(-25√2, 25√2) = (-25(1+√2), 25(2+√2))
James is 25(1+√2) ≈ 60.4 steps west of center.
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iii. James is 25(2+√2) ≈ 85.4 steps north of center.
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iv. The distance can be found using the Pythagorean theorem (or distance formula). The distance from the origin to the final position (OF in the diagram) will be the root of the sum of the squares of the north and west displacements:
distance = √(85.355² +60.355²)
distance ≈ 104.5 steps
The bearing can be found using the arctangent function. The diagram shows you the reference angle (relative to the +y direction) has an opposite side equal to the west displacement, and an adjacent side equal to the north displacement. Then the bearing angle (β) will be ...
tan(β) = opposite/adjacent = -60.355/85.355
β ≈ arctan(-0.707106) ≈ -35.3°
The positive bearing angle is 360° added to this, or
bearing = 324.7°
