Concept explainers
During a parasailing ride, the boat is traveling at a constant 30 km/hr with a 200-m long tow line. At the instant shown, the angle between the line and the water is 30° and is increasing at a constant rate of 2°/s. Determine the velocity and acceleration of the parasailer at this instant.
Fig. P11.163 and P11.164
The velocity
Answer to Problem 11.163P
The velocity
Explanation of Solution
Given Information:
The boat is traveling at a constant speed
The radius (r) of tow line is
The angle
Calculation:
Convert the kilometer per hour to meter per second.
Consider
Show the Free body diagram of parasailer and boat as in Figure (1).
Write the velocity
The acceleration vector of the boat is as follows:
Differentiate angle
Differentiate radius (r) with respective to time (t).
Differentiate
Write the expression for velocity vector
Here,
Write the expression for acceleration vector
Here,
Calculate the velocity vector
Substitute 0 for
Calculate the acceleration vector
Substitute 0 for
Write the velocity vector
Substitute
Write the acceleration vector
Substitute
Calculate the velocity vector
Substitute
Here,
Calculate the velocity
Substitute
Calculate the angle
Substitute
Calculate the acceleration vector
Substitute
Here,
Calculate the acceleration
Substitute
Calculate the angle
Substitute
Therefore, the velocity
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Chapter 11 Solutions
Vector Mechanics for Engineers: Statics and Dynamics
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