Spaceman Spiff is flying his rocket on patrol when he gets a distress call. An asteroid is on a collision course with a space station. The asteroid contains a newly discovered form of life, so Spiff must save both the asteroid and the space station. The easiest way to do this is to land his spaceship on the asteroid upside down so that the main rocket engines will point away from the asteroid. Spiff can then fire his engines and speed the asteroid up enough to that it will pass in front of the space station. If the asteroid has a mass of 18.5 Mkg, how much work Spiff’s rocket engines have to do if he wants to increase the asteroid’s speed by 23 km/s? How much work must his engines do if he decides it would be better to slow the asteroid down by 18.5 km/s?

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

While studying chemical reactions and conservation of matter, sarah's class conducted a variety of experiments. sarah and her lab partner found the mass of a wax candle and placed the candle in a flask. the students lit the candle and let it burn to completion. all that was left was wax and charred candle wick. per their teacher's instructions, the students found the mass of the products. their data can be seen in the data table. formulate a hypothesis the students could test to explain why the experiment did not support the law of conservation of matter. a) the students could repeat the experiment using different candles; there might have been a flaw in the candle. b) the experiment should be repeatable. the students should run several trials and then take an average of the after mass in each trial. c) the students should have someone in the class check their measurement skills as they repeat the experiment. they may have made an error using the balance. d) the students should burn the candle in a container that has some type of lid so that any gas that is a product of the reaction can be contained and massed. submit

Properties seen when one one substance changes to another are known as properties