Which device in a car to protect riders from the effects of inertia in the event of an accident? a) brakes b) bumper c) horn d) seatbelts

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

Inside of a windmill or a dam is a that is used to transform one type of energy into electrical energy. a. motor b. generator c. transformer d. power pack

Which are true about beta reactions? there will be more than one answer. a. it has no change b. it doesn't change the mass of the number c. it has a mass of 0.0005 atoms d. it causes transmutation.