Question

In: Physics

(section 11-6; 11-7 in 3rd edition) A windmill with moment of inertia I is not rotating...

(section 11-6; 11-7 in 3rd edition) A windmill with moment of inertia I is not rotating until a passing eagle grabs on to the top of it with her talons as she flies by.   The "system" of interest is the eagle plus the blades of the windmill. Check all the statements that are true. All angular momentum is to be calculated relative to the center (pivot) of the windmill.

Group of answer choices

There is no angular momentum until the bird and wheel start spinning.

Linear momentum has been converted to angular momentum.

Linear momentum has been absorbed by the Earth.

There is more kinetic energy after the grab than before.

There is less kinetic energy after the grab than before.

There is more angular momentum after the grab than before.

There is less angular momentum after the grab than before.

Solutions

Expert Solution

All the statements and whether they are true or false have been tabulated below with explaination.

Statements True / False Explanantion

There is no angular momentum until the bird and wheel start spinning.

True Angular momentum is defined as the product of moment of Inertia and angular velocity, and angular velocity is zero until the eagle sits on the windmill. So, angular momentum is zero.

Linear momentum has been converted to angular momentum.

True Linear momentum of the eagle has been converted into angular momentum of the eagle plus windmill system.

Linear momentum has been absorbed by the Earth.

False As the eagle sits on the windmill it starts rotating. So, linear momentum of the eagle has been converted into angular momentum of the eagle plus windmill system. So, linear momentum is not absorbed by the Earth.

There is more kinetic energy after the grab than before.

False

After the grab, all the kinetic energy of eagle is converted into the rotational energy of the eagle plus windmill system.

There is less kinetic energy after the grab than before.

True After the grab, all the kinetic energy of eagle is converted into the rotational energy of the eagle plus windmill system.

There is more angular momentum after the grab than before.

True Before the grab there is only linear momentum which is converted into angular momentum after the grab.

There is less angular momentum after the grab than before.

False Before the grab there is only linear momentum which is converted into angular momentum after the grab.

Related Solutions

How calculation of moment of inertia will influence the bending stress value of a rectangular section?...
How calculation of moment of inertia will influence the bending stress value of a rectangular section? Also find the bending stress for a rectangular section of size 3500 mm X 650 cm in which the bending moment will be taken as 300x103 Nmm.
Consider a gas of diatomic molecules at temperature T, each with moment of inertia I. If...
Consider a gas of diatomic molecules at temperature T, each with moment of inertia I. If Eg is the ground-state energy and Eex is the energy of an excited state, then the Maxwell-Boltzmann distribution predicts that the ratio of the number of molecules in the two states is nex ng = e −(Eex−Eg)/kBT . (1) a) Suppose we consider the excited state to be the ℓth rotational energy level, and the ground state to be ℓ = 0. Show that...
A merry-go-round with a a radius of R = 1.98 m and moment of inertia I...
A merry-go-round with a a radius of R = 1.98 m and moment of inertia I = 193 kg-m2 is spinning with an initial angular speed of ω = 1.45 rad/s in the counter clockwise direection when viewed from above. A person with mass m = 67 kg and velocity v = 4.9 m/s runs on a path tangent to the merry-go-round. Once at the merry-go-round the person jumps on and holds on to the rim of the merry-go-round. 1)...
Physics Question: A wheel has a radius of .5 m and a moment of inertia I...
Physics Question: A wheel has a radius of .5 m and a moment of inertia I = 3kg m^2. It is rotating at 20 rev/s about an ais through its center when a stick, acting as a brake, is applied to the outer edge. It is brought to rest in 30 seconds a.) Find the angular acceleration of the wheel b.) How many revolutions does it make before coming to rest? c.) How much kinetic energy does it lose in...
14N16O has a force constant, k, of 1550 N/m and a moment of inertia, I, of...
14N16O has a force constant, k, of 1550 N/m and a moment of inertia, I, of 1.642x10-46 kg m2. a. What is the wavenumber of the photon that will be absorbed during the v=2 to v=3 vibrational transition if it acts as a harmonic oscillator? b. What is the wavenumber of a photon that will be absorbed during the same transition in part (a) if the molecule behaves instead as an anharmonic oscillator with an anharmonicity constant of 0.007392? c....
1.) An electric motor can accelerate a Ferris wheel of moment of inertia I = 19500...
1.) An electric motor can accelerate a Ferris wheel of moment of inertia I = 19500 kg·m2 from rest to 10.1 rev/min in 12.0 s. When the motor is turned off, friction causes the wheel to slow down from 10.1 to 8.1 rev/min in 10.0 s. (a) Determine the torque generated by the motor to bring the wheel to 10.1 rev/min. (b) Determine the power that would be needed to maintain this rotational speed. W 2.)A disk-shaped merry-go-round of radius...
Mubarak textbook Construction Project Scheduling and Control - 3rd edition(Chapter 11) can be used as reference,...
Mubarak textbook Construction Project Scheduling and Control - 3rd edition(Chapter 11) can be used as reference, but problem not from textbook PROBLEM 2 2. A project team developed a detailed construction plan that includes activities with uncertain durations, including precedence constraints. The plan was simulated 10 times, and using a significance level (α) of 0.05, the expected project duration was found to be: 365 ± 47 days In other words, the true mean duration could be anywhere between 318 days...
explain how to calculate the moment of inertia of a disk, we will take the example of a uniform thin disk which is rotating about an axis through its centre.
 explain how to calculate the moment of inertia of a disk, we will take the example of a uniform thin disk which is rotating about an axis through its centre.
Three rotating masses A = 7 kg, B = 12 kg, and C = 11 kg,...
Three rotating masses A = 7 kg, B = 12 kg, and C = 11 kg, are attached to a shaft with their centres of gravity at 25 mm, 55 mm and 35 mm respectively from the shaft axis. The angular positions of B and C from A are respectively 90o and 150o measured in the same direction. The distance between the planes of rotation of A and B is 1.75 m and between B and C is 2 m...
Using the following sample data; 6, 7, 11, 6, 11, 5, 15, 11, 5; Compute the...
Using the following sample data; 6, 7, 11, 6, 11, 5, 15, 11, 5; Compute the sample standard deviation using either the computing formula or the defining formula. A. 3.6 B. 3.5 C. 3.4 D. 3.3
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT