The Moon's Sidereal Period Is 2

question 51

Multiple Choice

The Moon's sidereal period is 2.2 days shorter than the period during which the Moon's phases change because:

• A) the Moon always keeps the same side turned toward the Earth
• B) the Earth must rotate so an observer can see the Moon
• C) the Moon's orbit is tilted with respect to the Earth's rotational axis
• D) the Earth moves significantly in its orbit around the Sun during that time
• E) the Moon's orbital speed varies

---

Definitions:

Open Market Operations

The purchase and sale of government bonds by a central bank as a means to regulate the economy's money supply and adjust interest rates.

Inflation

The speed at which the overall price level of goods and services increases, leading to a decline in the currency's buying power.

Interest Rates

The cost of borrowing money or the reward for saving, usually presented as a percentage.

Bond Prices

The market price at which a bond is traded, which inversely varies with interest rates and the bond's perceived risk.