According to legend, galileo dropped two balls from the tower of pisa to see which would fall
faster. suppose one of the balls had a mass of 5.0 kilograms. given the acceleration of gravity is 9.8m/sec? , what was the weight of the ball in newtons?

After the near spacecraft passed mathilde, on several occasions rocket propellant was expelled to adjust the spacecraft's momentum in order to follow a path that would approach the asteroid eros, the final destination for the mission. after getting close to eros, further small adjustments made the momentum just right to give a circular orbit of radius 45 km (45 × 10^3 m) around the asteroid. so much propellant had been used that the final mass of the spacecraft while in circular orbit around eros was only 545 kg. the spacecraft took 1.04 days to make one complete circular orbit around eros. calculate what the mass of eros must be.

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.