Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.5 m × 4.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the mid-points of the shorter sides and is parallel to the longer sides?

a. 2.2 kg/m2
b. 2.8 kg/m2
c. 2.5 kg/m2
d. 3.1 kg/m2
e. 1.6 kg/m2


c

Physics & Space Science

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The radius of Earth is about __________ mi

a. 6000 b. 8000 c. 4000 d. 2000

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A proton with mass 1.67 × 10^?27 kg moves with a speed of 0.560c in an accelerator. What is its kinetic energy? (c = 3.00 × 10^8 m/s)

a. 1.50E–10 J b. 1.81E–10 J c. 3.11E–11 J d. 1.03E–10 J e. 4.71E–11 J

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What is the basic definition of a black hole?

A) any compact mass that emits no light B) a dead star that has faded from view C) any object from which the escape velocity exceeds the speed of light D) any object made from dark matter E) a dead galactic nucleus that can only be viewed in infrared

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If a neutron star attains a mass over ________ solar masses it becomes a black hole

Fill in the blank(s) with correct word

Physics & Space Science