Which statements about gravity are true 1.gravity us stay situated on earth without floating away 2.gravity gives objects their mass 3.gravity holds our galaxy together 4.multiplying the mass of an object by the acceleration due to gravity gives the weight of the object 5gravity scientists launch space craft out of earths atmosphere you can pick more then

1.gravity helps us stay situated on earth without floating away  

3.gravity holds our galaxy together

4.multiplying the mass of an object by the acceleration due to gravity gives the weight of the object  

Explanation:

Man can float on moon. This is because the force of gravity on the moon is less than that on Earth. Thus gravity helps us not float away on Earth.  

All matter contains mass and has nothing to do with gravity. Option 2 is incorrect.

Gravity is a collection of billions of stars that are held together by gravity. Option 3 is correct.

Weight of the object is the product of the mass of an object and the acceleration due to gravity. Option 4 is correct.

Scientists launch space craft out of earths atmosphere  against Earth's gravity. Option 5 is incorrect.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.