An eclipse involving the Sun, Earth, and Moon can occur A. Every year at the same time

B. Only when the planets change

C. Only when they are in a straight line

D. only every 100 years

c.

Explanation:

Those types of clipses can occur only then the Sun, Moon, and Earth line up perfectly, that is, when the line of interesection of the Earth's orbit plane and the Moon's points directly at the Sun. This is called the line of nodes. The movement of the line of nodes causes the eclipse seasons to vary from one year to the next.

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft