(a) a fundamental law of motion states that the acceleration of an object is directly proportional to the resultant force exerte
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Decay of Ar-40 produces 1.33 mmol of K-40. Remaining number of moles of Ar-40 is 1.50 mmol. Initial mmol of Ar-40 present will be sum of number of moles of K-40 and remaining number of moles of Ar-40.
now, half life time of the reaction is
For first order reaction, rate constant and half-life time are related to each other as follows:
Putting the value of ,
Rate equation for first order reaction is as follows:
Here, is initial concentration and
is concentration at time t.
Therefore, time required to cool the rock is .
Hi there!
We can begin by doing a summation of forces for each block.
Block A:
This block has the force of tension (in direction of acceleration +) and static friction (opposite direction -) acting on it. Thus:
Block B:
This block has the force of tension (opposite of acc. -) and gravity (in direction of acc +), working on it.
Add both of the expressions and solve for the maximum mass of Block B.
To find the minimum value, we can set a = 0, so:
The block must weigh <u>> 16 kg</u> for block A to move.
Answer:
The ratio of the escape velocity to the orbital velocity is .
Explanation:
The minimum velocity given to an object so that it escapes from the earth's gravitational pull is called escape velocity.
The formula of the escape velocity is
The velocity of an object in the orbit around the earth is called orbital velocity.
The formula of the orbital velocity is
The ratio of the escape velocity to the orbital velocity is