Question

At the instant $\theta = 55^\circ$, the boy's center of mass G is momentarily at rest. (Figure 1) Part A Determine his speed when $\theta = 90^\circ$. The boy has a weight of 70 lb. Neglect his size and the mass of the seat and cords. Express your answer to three significant figures and include the appropriate units. 9.567 $\frac{ft}{s}$ Incorrect; Try Again; 5 attempts remaining Part B Determine the tension in each of the two supporting cords of the swing when $\theta = 90^\circ$ Express your answer to three significant figures and include the appropriate units. T = Value Units

          At the instant $\theta = 55^\circ$, the boy's center of mass G is momentarily at rest. (Figure 1)
Part A
Determine his speed when $\theta = 90^\circ$. The boy has a weight of 70 lb. Neglect his size and the mass of the seat and cords.
Express your answer to three significant figures and include the appropriate units.
9.567
$\frac{ft}{s}$
Incorrect; Try Again; 5 attempts remaining
Part B
Determine the tension in each of the two supporting cords of the swing when $\theta = 90^\circ$
Express your answer to three significant figures and include the appropriate units.
T = Value Units

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At the instant θ = 55^∘, the boy's center of mass G is momentarily at rest. (Figure 1)
Part A
Determine his speed when θ = 90^∘. The boy has a weight of 70 lb. Neglect his size and the mass of the seat and cords.
Express your answer to three significant figures and include the appropriate units.
9.567
(ft)/(s)
Incorrect; Try Again; 5 attempts remaining
Part B
Determine the tension in each of the two supporting cords of the swing when θ = 90^∘
Express your answer to three significant figures and include the appropriate units.
T = Value Units

Added by Anthony A.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Jacob Fry

Step 1

At θ = 55°, the boy's center of mass G is momentarily at rest, which means that all of his initial potential energy is converted into kinetic energy at θ = 90°. The potential energy at θ = 55° is given by: PE = mgh where m is the mass of the boy, g is the Show more…

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Problem 13.61 At the instant Î¸ = 55Â°, the boy's center of mass G is momentarily at rest. (Figure 1) Part A Determine his speed when Î¸ = 90Â°. The boy has a weight of 70 lb. Neglect his size and the mass of the seat and cords. Express your answer to three significant figures and include the appropriate units. Part B Determine the tension in each of the two supporting cords of the swing when Î¸ = 90Â°. Express your answer to three significant figures and include the appropriate units. At the instant Î¸ = 55Â°, the boy's center of mass G is momentarily at rest. (Figure 1) Part A Determine his speed when Î¸ = 90Â°. The boy has a weight of 70 lb. Neglect his size and the mass of the seat and cords. Express your answer to three significant figures and include the appropriate units. Part B Determine the tension in each of the two supporting cords of the swing when Î¸ = 90Â°. Express your answer to three significant figures and include the appropriate units.

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