Asolid ball of inertia m rolls without slipping down a ramp that makes an angle θ with the horizontal.

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

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.

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch