The distance between two planets is 1600 km. How much time would the light
signal take to go from one planet to the other?

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.