it's either the first or second choice 
 
        
                    
             
        
        
        
That particular group of elements is reffered to as the "Noble Gasses"--a title that comes from the fact that these gases are very "secure" and don't mix well with other elements. 
        
             
        
        
        
Answer:
460 g
Explanation:
Heat lost by the warm water = heat gained by the cold water
-mCΔT = mCΔT
-m (4.184 J/g/K) (37°C − 85°C) = (1000 g) (4.184 J/g/K) (37°C − 15°C)
-m (37°C − 85°C) = (1000 g) (37°C − 15°C)
-m (-48°C) = (1000 g) (22°C)
m = 458 g
Rounded to two significant figures, you need a mass of 460 g of water.
 
        
             
        
        
        
Speed = (acceleration) x (time)
Velocity = (speed) in (direction of the speed)
Speed = (-3 m/s²) x (5 s) = 15 m/s
Velocity = 
             (15 m/s) in the direction opposite to the direction you call positive.
Displacement = (distance between start-point and end-point) 
                           in the direction from start-point to end-point.
Distance = (1/2) (acceleration) (time)²
Distance = (1/2) (3 m/s²) (5 s)²
                 = (1/2) (3 m/s²) (25 s²)  =  37.5 meters
Displacement = 
                     37.5 meters in the direction opposite to the direction you call positive.
        
             
        
        
        
Answer:
Explanation:
Initial angular velocity ω₀ = 151 x 2π / 60
= 15.8  rad /s 
final velocity = 0 
Angular deceleration α = 2.23 rad / s 
ω² = ω₀² -  2 α θ
0 = 15.8² - 2 x 2.23 θ
= 55.99  rad 
one revolution = 2π radian 
55.99 radian = 55.99  / 2 π no of terns
= 9 approx .