During a solar eclipse, the sun, earth, and moon align, with the moon in the middle. Determine the magnitude of the net gravitational force on the moon from the earth and sun during a solar eclipse. m E is the mass of the earth, m S is the mass of the sun, m M is the mass of the moon, and the distances are defined as follows: R E M = distance from earth to moon (measured center of mass to center of mass) R E S = distance from earth to sun (measured center of mass to center of mass)

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

The charge on a charged sphere is: a)concentrated at its centerb)distributed uniformly throughout its volumec)clustered on its centerd)distributed uniformly over its surface