Astronomers estimate that a 2.0 km diameter asteroid collides with the earth once every million years. the collision could pose a threat to life on earth. assume a spherical asteroid has a mass of 3020 kg for each cubic meter of volume and moves toward the earth at 13.3 km/s. how much destructive energy could be released when it embeds itself in the earth?

Which statements best describe medical uses for radioactive isotopes? check all that apply. radioactive isotopes are used to detect medical problems. high-energy gamma rays are injected into the body. radioactive isotopes are used to treat some diseases. radiation is used to kill cancer cells. radioactive isotopes are directed at tumors from outside the body.