science
Grade-11
Easy
Question
If the river's width is 4 m and the angle of the drift is 30 degrees, the velocity of the person on the boat concerning the river is 3 m/s. Find the time taken to cross the river.
- 3.2
- 1.5
- 2.6
- 6.3
Hint:
1.5 s
The correct answer is: 1.5
Given:
Speed of the person on the boat (Vp) = 4ms-1
The angle of drift (
) = 
Width of the river = 4m
To find:
Time taken =?
Solution:
By using the trigonometric function,
Answer:
Time taken to cross the river = 1.5s
Related Questions to study
science
Let us consider two cars, A and B, are moving with constant acceleration 4 m/s2 and constant velocity 6 m/s with t = 0 s, both cars are 20 m apart, car A is behind car B, find the time when car A overtakes car B.
Let us consider two cars, A and B, are moving with constant acceleration 4 m/s2 and constant velocity 6 m/s with t = 0 s, both cars are 20 m apart, car A is behind car B, find the time when car A overtakes car B.
scienceGrade-11
science
Let us consider two cars, A and B, are moving with a constant acceleration of 2 m/ s2 and a constant velocity of 3 m/s with t=0 s. Bo the cars are 12 m apart, car A is behind car B. Find the time when car A overtakes car B.
Let us consider two cars, A and B, are moving with a constant acceleration of 2 m/ s2 and a constant velocity of 3 m/s with t=0 s. Bo the cars are 12 m apart, car A is behind car B. Find the time when car A overtakes car B.
scienceGrade-11
science
If a body moved to a displacement of 4 m in 2 s. Find the velocity of the body.
If a body moved to a displacement of 4 m in 2 s. Find the velocity of the body.
scienceGrade-11
science
An observer is watching a car moving with constant velocity. He assumes the person is at rest.
An observer is watching a car moving with constant velocity. He assumes the person is at rest.
scienceGrade-11
science
If a dog swims across the river with 3 m/s and the river's speed is 4 m/s. Find the velocity of the dog.
If a dog swims across the river with 3 m/s and the river's speed is 4 m/s. Find the velocity of the dog.
scienceGrade-11
science
If a boat moves on the river with the speed of 50 km/h and also moves in other directions relatively with a speed of 30 km/h. What is the speed of the boat?
If a boat moves on the river with the speed of 50 km/h and also moves in other directions relatively with a speed of 30 km/h. What is the speed of the boat?
scienceGrade-11
science
Relative motion can be used to evaluate ________.
Relative motion can be used to evaluate ________.
scienceGrade-11
science
Newton’s laws are not applicable in ___________.
Newton’s laws are not applicable in ___________.
scienceGrade-11
science
If a man jumps out of running train, then ____________.
If a man jumps out of running train, then ____________.
scienceGrade-11
science
Drawing a diagram and explaining the motion is called as ________
Drawing a diagram and explaining the motion is called as ________
scienceGrade-11
science
On Earth, if a body is in the car and the car is moving with the uniform velocity, then the body in the vehicle is ___
On Earth, if a body is in the car and the car is moving with the uniform velocity, then the body in the vehicle is ___
scienceGrade-11
science
Concerning the motion, there are ______ Newton’s laws.
Concerning the motion, there are ______ Newton’s laws.
scienceGrade-11
