4) which of the following gases are typically used for colorful lighting when an electric current is applied ? a) hydrogen and heliumb) argan and krypton c) fluorine and chlorine d) oxygen and nitrogen a shawty out

Awoman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. the book has a mass of m = 1.8 kg and the coefficient of static friction between her hand and the book is μs = 0.67. no attempt 50% part (a) what is the weight of the book, fgb in newtons?

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass