<u>Answer</u>
81.94 m
<u>Explanation</u>
The centripetal force of an object moving in a circular path is given by:
F = mv²/r  Where m is the mass of the object, v is the constant velocity and r is the radius of the curve.
F = mv²/r 
3,300 = (1600×13²)/r
3,300 = 270,400/r
r = 270,400/3,300
   = 81.94 m
 
        
             
        
        
        
Answer: c. the molecules with the highest energy evaporate first, lowering the temperature of the sample 
Explanation:
The process by which liquid starts to change into vapor phase at any temperature is known as evaporation.
During evaporation , the molecules which possess higher energies escape from the upper layer into vapor phase. the molecules which escape draw energy from surroundings and thus decrease the energy of the surroundings and hence lead to decrease in temperature.
As temperature of the system is directly proportional to the energy of the system , thus decrease in energy leads to decrease in temperature.

K.E. = Kinetic energy
T = temperature 
R= gas constant
 
        
             
        
        
        
Answer:
Height, H = 25.04 meters
Explanation:
Initially the ball is at rest, u = 0
Time taken to fall to the ground, t = 2.261 s
Let H is the height from which the ball is released. It can be calculated using the second equation of motion as :

Here, a = g
 
             
 
 
H = 25.04 meters
So, the ball is released form a height of 25.04 meters. Hence, this is the required solution.