An astronaut is walking in space. which of these would have the greatest speed as observed by the astronaut? a. a high speed electron b. a strong magnetic field c. an electromagnetic wave d. a longitudinal wave carrying sound

The metal wire in an incandescent lightbulb glows when the light is switched on and stops glowing when it is switched off. this simple process iswhich kind of a change? a.a physical changeb. a chemical changec. a nuclear changed. an ionic change

An object has a weight of 500 on earth what is the mass of this object

10 newton object is placed 3 meters from the fulcrum. at what distance on the other side would you need to place a 15 newton object to balance the lever? show your work!