# pre-calculus

posted by .

A man who can row in still water at 3 mph heads directly across a river flowing at 7 mph.

At what angle to the line on which he is heading does he drift downstream and at what speed does he drift downstream?

• pre-calculus -

He drifts downstream at the river's speed, 7 mph. He has a 3 mph component across the river.

His direction with respect to the heading angle (straight across) is
tan^-1 7/3 = 66.8 degrees (towards downstream)

## Respond to this Question

 First Name School Subject Your Answer

## Similar Questions

1. ### trig

A river is 2000 ft wide and flowing at 6 mph from north to south. A woman in a canoe starts on the eastern shore and heads west at her normal paddling speed of 2 mph. In what direction (measured clockwise from north) must she aim her …
2. ### trigonometry

A river is 2000 ft wide and flowing at 6 mph from north to south. A woman in a canoe starts on the eastern shore and heads west at her normal paddling speed of 2 mph. In what direction (measured clockwise from north) must she aim her …
3. ### trigonometry

A river is 2000 ft wide and flowing at 6 mph from north to south. A woman in a canoe starts on the eastern shore and heads west at her normal paddling speed of 2 mph. In what direction (measured clockwise from north) must she aim her …
4. ### vectors components

plz answer my question a river is 2 km wide and flows at 4km/h. a motorboat has a speed of 10 km/h in still water and heads out from one bank. a marina is directly across the river, on the opposite bank. if the motorboat heads directly …
5. ### phys

A boat is traveling upstream at 14 mph with respect to a river that is flowing at 6 mph (with respect to the ground). A man runs directly across the boat, from one side to the other, at 6 mph (with respect to the boat). The speed of …
6. ### Physics Dynamics

Swimming at 2.00 m/s relative to still water, a swimmer heads directly across a river of width 80 m. He arrives 35 m downstream from the point directly across the river from his starting point. (a) What is the speed of the current …
7. ### Pre Calculas

A man who can row in still water at 3 mph heads directly across a river flowing at 7 mph. At what speed does he drift downstream?
8. ### calculus

A person can row at a constant speed of 6 miles per hour. If the rower wants to row directly across a river with a current of 2 mph, at what angle should they row?
9. ### Physics

Swimming at 3.00 m/s relative to still water, a swimmer heads directly across a river of width 80 m. He arrives 50 m downstream from the point directly across the river from his starting point. (a) What is the speed of the current …
10. ### Physics

If a man is able to row at 5m/s in still water and he points his boat at a 50 degree angle from the shore in an upstream direction in a river that's flowing at 4 m/s how far, either up or downstream will be land on the other side of …

More Similar Questions