A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of 2.25 kg • m2. If the arms are pulled in so the moment of inertia decreases to 1.80 kg • m2, what is the final angular speed?
A) 2.25 rad/s
B) 4.60 rad/s
C) 6.25 rad/s
D) 1.76 rad/s
E) 0.810 rad/s
C
You might also like to view...
A conducting bar rests on two parallel horizontal rails 50 cm apart forming a square area. The resistance of the bar and the rails is assumed to be constant and equal to 0.05 ?
A uniform magnetic field 0.5 T is perpendicular to the plane of the rails. The value of the field is uniformly reduced to zero in a time of 0.1 s. What is the maximum value of the force acting on the bar during that time? A) 6.25 N B) 4.12 N C) 2.05 N D) 5.75 N E) 1.00 N
In the context of the evidence on evolution of stars, you can estimate the _____ of a star cluster by observing the distribution of the points that represent its stars in the Hertzsprung-Russell (H-R) diagram
A) age B) density C) composition D) mass
Which of the following is a consequence of the discovery of hot Jupiters for understanding our own Solar System?
A) It shows that our Solar System is very unusual. B) It shows that our Solar System is very typical. C) It shows that we do not fully understand the formation of our Solar System. D) It shows that life in the Universe is rare. E) It shows that Jupiter is unusually cold.
If an element has 15 protons and 16 neutrons and 15 electrons, what is the mass number of the element?
A) 31 B) 15 C) 16 D) 30 E) none of the above