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Complete these questions on your own paper or word document. When you are done, you will submit your answers for grading. You must show all of your work to receive full credit.
Each year at a college, there is a tradition of having a hoop rolling competition. Alex rolls his 0.25 kg hoop down the course. If the hoop has a radius of 0.5 m, what is the moment of inertia of Alex’s rolling hoop?
A particular planet has a moment of inertia of 9.74 × 1037 kg•m2 and a mass of 5.98 × 1024 kg. Based on these values, what is the planet’s radius?
Jessica stretches her arms out 0.6 m from the center of her body while holding a 2 kg mass in each hand. She then spins around on an ice rink at 1.1 m/s.
What is the combined angular momentum of the masses? If she pulls her arms into 0.15 m, what is her linear speed if the angular momentum remains constant?

Respuesta :

I dont understand the question

Answer:a) 0.0623kg/m^2

b) 4,000,000m^2

C) 2.64 = angular momentum

d) combined angular momentum = 3.3

Explanation:

a) m = 0.25kg radius = 0.5m

For hoop,moment of inertia = I = mr^2= (0.25)(0.5)^2 = 0.0625kg/m^2

b) I = mr^2

r^2= I/m = 9.74 ×10^37/5.98 ×10^24

r = sqrt1.6 ×10^13

r = 4000000m^2

c) Angular momentum L = rev

L = 2×0.6×2×1.1=2.64

L = 2 × 0.15×2×1.1=0.66

Combined angular momentum = 0.66 + 2.64 =3.3

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