Answer:
Three lunar eclipses every year.
Explanation:
A lunar eclipse only occurs during a full Moon, when the Sun, Earth and Moon are all aligned. But despite the Moon only taking 29.5 days to orbit Earth and complete a cycle from full Moon to full Moon, there are only on average about three lunar eclipses every year.
Answer: 1.96 m/s
Explanation:
Given
Mass of Professor
Velocity of professor
mass of chair
velocity of chair
Suppose after the collision, v is the common velocity
Conserving momentum
Condensation.
Would be the right answer.