The weight of an astronaut on the surface of planet Z, due only to its gravitational pull, is equal to 389 N. If moved to a distance equal to 10 × 1,86 4 mi above the surface of the planet, the value of the weight is changed to 24.31 N . What is the mass of planet Z if the mass of the astronaut is equal to 75.0 kg ? ( G = 6.67 × 10 -11 N ∙ m 2 / kg 2 )

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

pretty sure it's false

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

conservation of mass

mass before something happens = mass afterwards