Explain why elements in the same family have similar physical and chemical properties

Why is the sky blue all the time

How do black holes loose energy when they orbit each other in binary?

As long the sun will be in the red giant? Question about time period, not when

A + B → C + D If there are 4 grams of product produced by the chemical reaction, how many grams of reactant were consumed? A) 0 grams B) 1 gram C) 2 grams D) 4 grams

List two examples of ways to increase efficiency in a machine.

Should the shape of an object be considered a property of the material?

Which external factor might influence one's decision to drink alcohol? fears desires friends interests

For which of the following refrigeration systems/appliances would it be permissible to use a passive recovery device for recovery of CFCs, HCFCs, and HFCs? A. A centrifugal air conditioner B. A reciprocating liquid chiller C.

The furnace keeps houseAat 25◦C, while thefurnace in houseBkeeps it at 20◦C. Which house requires heat to be supplied by its furnace at a faster rate? 1. House B requires heat at a slightly faster rate than A. 2.

An airplane begins its take-off run at A with zero velocity and a constant acceleration a. Knowing that it becomes airborne 30 s later at B with a take-off velocity of 270 km/h, determine (a) the acceleration a, (b) distance AB.