Star s has a second planet y. this planet has two moons that move in circular orbits around the planet. moon 1 has mass m1 = 1.8 × 1018 kg, orbital radius r1 = 5.2 × 1011 m, and speed v1 = 2400 m/s. moon 2 has a mass m2 = 0.85m1 and orbital radius r2 = 0.35r1.what is the speed of and moon 2, v2, in terms of v1? v2 = 0.122 v1v2 = 1.69 v1v2 = 0.35 v1v2 = 0.592 v1v2 = 2.43 v1v2 = 2.86 v1

Air is held within a frictionless piston-cylinder container, which is oriented vertically. the mass of the piston is 0.45 kg and the cross-sectional area is 0.0030 m2. initially (state 1) the pressure of the gas is sufficient to support the weight of the piston as well as the force exerted by the atmospheric pressure ( 101.32 kpa). the volume occupied by the air within the cylinder in state 1 is 1.00 liter. one end of a spring (with spring constant k = 1000 n/m) is attached to the top of the piston, while the other end of the spring is attached to a stage that can move vertically. initially the spring is undeflected and therefore exerts no force. then the stage is then moved quasistatically downward a distance of 10.0 cm, at which point the system reaches state 2. the piston-cylinder is not insulated; rather it remains in diathermal contact with the surroundings, which are at a constant temperature of 300 k. what is the change of pressure within the container?

Phase changes are chemical changes. true or false

which statements describe the image? check all that apply.the wood is releasing argon gas.this information is useful for dating ancient rock.the process works only with organic matter.the element has a half-life of 5,730 years.this shows the half-life of carbon-19.