The nucleus of some isotopes will spontaneously undergo nuclear decay. these isotopes are said to be radioactive. what causes the nucleus of an isotope to be radioactive? question 17 options: a. the net charge of the atom b. the attraction of protons to electrons c. an unstable ratio of protons and neutrons exposure to toxic chemicals d. too many electrons in its orbitals

Aferris wheel is a vertical, circular amusement ride with radius 9 m. riders sit on seats that swivel to remain horizontal. the ferris wheel rotates at a constant rate, going around once in 9 s. consider a rider whose mass is 56 kg. at the bottom of the ride, what is the perpendicular component of the rate of change of the rider's momentum? at the bottom of the ride, what is the vector force exerted by the seat on the rider?

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

Given the position vector of the particle r(t)=(t+1)i+(t^2−1)j+2t k, find the particle's velocity and acceleration vectors at t=1