The maximum tension that a 0.80 m string can tolerate is 15 N. A 0.35-kg ball attached to this string is being whirled in a vert
1 answer:
Answer:
v=5.86 m/s
Explanation:
Given that,
Length of the string, l = 0.8 m
Maximum tension tolerated by the string, F = 15 N
Mass of the ball, m = 0.35 kg
We need to find the maximum speed the ball can have at the top of the circle. The ball is moving under the action of the centripetal force. The length of the string will be the radius of the circular path. The centripetal force is given by the relation as follows :
v is the maximum speed
Hence, the maximum speed of the ball is 5.86 m/s.
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Answer:
Calculate the ratio of the rates of ozone destruction by these catalysts at 20 km, given that at this altitude the average concentration of OH is about 100 times that of Cl and that the temperature is about -50 °C
Knowing
Rate constants for the reactions of atomic chlorine and of hydroxyl radical with ozone are given by 3x and 2x
T = -50 °C = 223 K
The reaction rate will be given by [Cl] [O3] 3x
Than, the reaction rate of OH with O3 is
Rate = [OH] [O3] 2x
Considering these 2 rates we can realize the ratio of the reaction with Cl to the reaction with OH is 330 * [Cl] / [OH]
Than, the concentration of OH is approximately 100 times of Cl, and the result will be that the reaction with Cl is 3.3 times faster than the reaction with OH
Calculate the rate constant for ozone destruction by chlorine under conditions in the Antarctic ozone hole, when the temperature is about -80 °C and the concentration of atomic chlorine increases by a factor of one hundred to about 4 × 105 molecules cm-3
Knowing
Rate constants for the reactions of atomic chlorine and of hydroxyl radical with ozone are given by 3x and 2x
T = -80 °C = 193 K
The reaction rate will be given by [Cl] [O3] 3x
Than, the reaction rate of OH with O3 is
Rate = [OH] [O3] 2x
Considering these 2 rates we can realize the ratio of the reaction with Cl to the reaction with OH is 535 * [Cl] / [OH]
Than, considering the concentration of Cl increases by a factor of 100 to about 4 × molecules
, the result will be that the reaction with OH will be 535 + (100 to about 4 ×
molecules
) times faster than the reaction with Cl
Explanation:
We can solve the problem by using the first law of thermodynamics:
where
is the change in internal energy of the system
is the heat absorbed by the system
is the work done by the system on the surrounding
In this problem, the work done by the system is
with a negative sign because the work is done by the surrounding on the system, while the heat absorbed is
with a negative sign as well because it is released by the system.
Therefore, by using the initial equation, we find