Using the astrometric method, you discover that an a2 main sequence has a velocity of 51.120 m/s due to the presence of an exoplanet orbiting at 0.39 au. follow up observations using the radial velocity method show a star velocity of 51.112 m/s. are transit observations possible if the planet is the size of jupiter? what about size of earth?

heat the gas and measure the pressure

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

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.