Gather data: Select Mercury from the Solar system menu at left. Turn on Additional data. In the table below, record Mercury’s Mass, Mean radius, and Density. Then repeat for each of the other planets as well as the dwarf planet Pluto. Include units. Planet
Mass (×1023 kg)
Mean radius (km)
Density (g/cm3)
Mercury

Venus

Earth

Mars

Jupiter

Saturn

Uranus

Neptune

Pluto (dwarf planet)

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.

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n

What is the moment of inertia i of this assembly about the axis through which it is pivoted? express the moment of inertia in terms of mr