Condensation happens when a gas changes into a liquid. Which of these is an example of condensation? O water vapor turning to rain
O water vapor turning to snow
O a pond melting in the spring
O a pond freezing in the winter

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.

What is work? how much work is done to move an object 0 meters?

What is the length x of the side of the triangle below? (hint: use the cosine function)