A ballerina spins initially at 1.5 rev/s when her arms are extended. She then draws in her arms to her body and her moment of inertia becomes 0.88 kg ? m2, and her angular speed increases to 4.0 rev/s. What was her initial moment of inertia?

What will be an ideal response?


2.3 kg ? m2

Physics & Space Science

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A very thin uniform rod, 2.40 m long and of weight 135 N, has a frictionless hinge at its lower end. It starts out vertically from rest and falls, pivoting about the hinge

Just as it has rotated through an angle of 55.0°, what is the downward acceleration of the end farthest from the hinge? A) 5.02 m/s2 B) 8.03 m/s2 C) 9.80 m/s2 D) 12.0 m/s2 E) 19.6 m/s2

Physics & Space Science

An ideal parallel-plate capacitor consists of a set of two parallel plates of area A separated by a very small distance d. When the capacitor plates carry charges +Q and -Q, the capacitor stores energy U0

If the separation between the plates is doubled, how much electrical energy is stored in the capacitor? A) 4U0 B) 2U0 C) U0 D) U0/2 E) U0/4

Physics & Space Science

What is the equivalent capacitance of the combination shown?



a.
29 µF

b.
10 µF

c.
40 µF

d.
25 µF

Physics & Space Science

The change in electrical potential energy per unit of charge that is moved from one place to another is known as ________

What will be an ideal response?

Physics & Space Science