# physics

posted by .

1. A yacht is tacking into the wind on a zigzag path. On the rst leg of the course, the yacht has a
displacement of 12 km at 840 north of east. After a second leg has been completed, the yacht's resultant
displacement is 10 miles at 230 west of south. Determine the magnitude and direction of the second leg
of the course.
2. A ferry boat crosses a 550-m wide river from the east to the west shore in 1 min and 9 s. (a) What is the
boat's average velocity? (b) The boat makes the return trip 500 m in 58 s. What is the boat's average
velocity for the return trip? (c) What is the boat's average speed for the entire round trip? What is the
boat's average velocity for the entire round-trip?
3. Suppose a gazelle is capable of accelerating from rest to its top speed of 25 m/s in a distance of 50 m
and, after attaining its speed, the animal can maintain it for an extended period of time. In addition,
suppose a cheetah can accelerate from rest to its top speed of 30 m/s in a distance of 60m, but then
can maintain this speed for only 4.0 s before it must give up the chase. How close to a gazelle must a
cheetah be before it can launch a successful attack?
4. A student throws a set of keys vertically upward to her sorority sister, who is in a window 4.00 m above.
The keys are caught 1.50 s later by the sister's outstretched hand. (a) With what initial velocity were
the keys thrown? (b) What was the velocity of the keys just before they were caught?

• physics -

Your umpteen posts have been removed.

Once you write up YOUR THOUGHTS, please re-post, and someone here will be happy to comment.

## Similar Questions

1. ### math

two look out situations, which are 25 miles apart along the coast on a north-south shoreline, spot an approaching yacht. One lookout station measures the direction to the yacht at N33 degrees E, and the other station measures the direction …
2. ### trigonometry

2. two look out situations, which are 25 miles apart along the coast on a north-south shoreline, spot an approaching yacht. One lookout station measures the direction to the yacht at N33 degrees E, and the other station measures the …
3. ### Math Trig

A coast guard patrol boat is 14.8 km east of the Brier Island Lighthouse. A disabled yacht is 7.5km south of the lighthouse. a) How far is the patrol boat from the yacht, to the nearest tenth of a kilometer?
4. ### maths

At the beginning of a race, a yacht crosses the start line and sails in westerly direction at a speed of 4 m s-1. The current of the sea is flowing at 2 m s-1 towards the north-east. Calculate how far [8 marks] and in what direction …
5. ### maths/physics/biomechanics

At the beginning of a race, a yacht crosses the start line and sails in westerly direction at a speed of 4 m s-1. The current of the sea is flowing at 2 m s-1 towards the north-east. Calculate how far [8 marks] and in what direction …
6. ### Maths (Trigonometry)

Raylene who was involved in an orienteering competition. The ﬁrst two legs of her triangular course are: • 1.2 km on a true bearing of 200 ° • 2.3 km on a true bearing of 320 ° . To ﬁnd the shortest way back to …
7. ### math

Two lookout stations, which are 25 miles apart along the coast on a north-south line, spot an approaching yacht. One lookout station measures the direction to the yacht at N 33degrees E, and the other station measures the direction …
8. ### Math

A yacht is moving at 10kmh in a south easterly direction and encounters a 3kmh current from the north. Find the actual speed and direction of the yacht.
9. ### maths

a yacht is moving at 10km/h in a south easterly direction and encounters a 3km/h current from the north. find the actual speed and direction of the yacht
10. ### Trig application

I am having trouble with this question. A privately owned yacht leaves a dock in Myrtke Beach, South Carolina, and heads toward Freeport in the Bahamas at a bearing of S 1.4 degrees E. The yacht averages a speed of 20 knots over the …

More Similar Questions