Answer:
The block's mass should be 
Explanation:
Given:
Cart with mass 
From the conservation of energy before mass is added,

Where
amplitude of spring mass system,
spring constant

Now new mass
is added to the system,


Here, given in question frequency is reduced to half so we can write,

Where
frequency of system before mass is added,
frequency of system after mass is added.




Therefore, the block's mass should be 
The answer to your question would be C
Answer:
D) Add a base like limestone or calcium carbonate.
Explanation:
-To reduce the soil's pH, you need to add an alkaline or base solution.
-Calcium carbonate has an alkanizing property and forms a carbonic acid and calcium hydroxide when dissolved in water.
-The solution will reduces the soil's pH.
There are 7 0r 8
Explanation: max atoms you can have are 8 but there is not an 8 in this question so either or
Answer:
The value of of the Boltzmann constant is
.
Explanation:
Generally the formula for average kinetic energy of a molecule :
where,
k = Boltzmann’s constant
T = temperature = 290 K
Given:
Number of molecules in 1.7 moles:

Average kinetic energy of 1.7 moles = 1.4 MJ =
Average kinetic energy of 1 molecule = 
