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1. Assuming there are 365 days in a year, how many days are required for the...

1. Assuming there are 365 days in a year, how many days are required for the Earth to undergo an angular displacement of 2.65 rad as it revolves around the Sun?

Entry field with incorrect answer now contains modified data days

2. A wagon wheel consists of a 2.77-kg hoop of radius 0.625 meters and 12 0.207-kg spokes.

(a) What is the moment of inertia of the wagon wheel for rotation about an axis through its center and perpendicular to the wheel?

kg·m2

(b) If the wheel is rotating with an angular speed of 48.2 rpm, then what is its rotational kinetic energy?

J

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Answer #1

here,

a)

the time period of earth revolutions around the Sun , T = 1 yr = 365 days

the angular velocity , w = 2 *pi /T

for theta = 2.65 rad

the time taken , t = theta /w

t = theta /2pi * T

t = 2.65 /2pi * 365 days

t = 154 days

the time taken is 154 days

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