Find the magnitude of the gravitational force exerted on a 66.5 kg astronaut on the surface of planet x if the planet has a radius of 4.40 x 10⁶ m and a mass of 8.43 x 10²³ kg. (use g= 6.67 x 10⁻¹¹ nm/kg²)

Carbon-14 is a radioactive element that undergoes beta decay. which force is responsible for allowing carbon-14 to become stable? electromagnetic gravitational weak nuclear strong nuclear

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?