What is meant when it is said that stars have a life cycle?

Stars produce living things.

Stars travel in circular orbits during their lives

Stars are born, mature, and eventually die.

Stars move about in their galaxies

A bridge is 500m long. A 100m long train crosses it at a speed of 30m/s. Find the time taken by the train to cross it.

The ratio of the length of an airplane wing to its width is 8 to 1. find the length of wing is 29.8 meters, how wide must it be?

What is the main natural force responsible for mass movement of rocks and debris?

What are some self care strategies that we can use to deal with everyday feelings? What does Sasha do? Does it work?

Which describes the use of a nonrenewable energy source? burning coal to create steam in power plants turning turbines with water held behind dams burning plant wastes to run generators

What is the momentum of a 15 kg tire rolling down a hill at 3 m/s? 5 kg • m/s 18 kg • m/s 45 kg • m/s 60 kg • m/s

Which of Newton's laws, when combined algebraically with his law of universal gravitation, can be used to calculate Earth's mass? A) first B) second C) third

Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not? A. Helium has no mass, but air does. B. Helium increases the balloon's mass more than air. C.

Consider the following controls in an automobile in motion : gas pedal, brake, steering wheel. what are the controls in this list that cause an acceleration of the car?

What material are oil pipelines made from?