7.3 kg m/s
First of all, let's calculate the gravitational potential energy of the stone as it reaches its highest point:
For the law of conservation of energy, this is equal to the initial kinetic energy of the stone at ground level (where the potential energy is zero), just after the stone leaves your hand:
From this equation we can find the velocity of the stone as it leaves your hand:
The initial velocity of the stone (before leaving your hand) is zero:
The impulse received by the stone is equal to its change in momentum, so:
1. <--> A.
2. <--> C.
3. <--> D
4. <--> B.
explanation: i know my science!
first we must convert decibels to intensity in
we use the following equation for the conversion:
Where is the intensity corresponding to the 86 decibels, and It is the minimum intensity that the human ear perceives:
So replacing , and clearing for
Now we use the exponential of 10 because this will cancel the logarithm.
Since , we have:
And because instead of two firecrackers now is only one, the intensity is reduced by half:
And now returning to the decibel unit:
we want to find the decibel value corresponding to the new intensity
the sound level if only one is exploted is 83dB
Answer: The correct answer is c
Explanation: When heat radiates it is showing moisture and mixed ways they combine
The mass is
From the question we are told that
The extension of the rod is
The area is
The density increase as follows
So at ,