Assuming planar orbits, calculate the hohmann transfer δv required and time of flight to transfer from a low earth circular orbit at a radius of 6628 km to the orbit of the moon (assume 60 earth radii). compare the hohmann δv with the δv of a three-maneuver strategy of (1) escaping to infinity on a parabolic orbit, (2) maneuvering from infinity to to approach the moon’s radius on a tangent path, and (3) circularizing at the moon orbital radius.

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.

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?