A.
Initially, the energy is used to overcome the attractions between the molecules. At this point the temperature of the sample does not increase. When the attractions have been overcome the energy then becomes kinetic energy of the molecules, increasing temperature
A neutral atom has a charge of zero which means that the number of protons or the positive charges is equal to the number of electrons or the negative charges. In this case, if the charge is zero, this should mean that the number of electrons is 2 less than the number of protons present in the atom.
Answer:
(A) The magnitude of the tension increases to four times its original value, 4F.
Explanation:
When an object moves in circular motion, a centripetal force acts on it . In this scenario the centripetal force acting on the stone is given by .
Where m is the mass of object
v- velocity or speed of the object
r - radius of the circle
Important to note is that the tension is equal to the centripetal force.
Given that initially the string makes one complete revolution per second and then speeds up to make two complete revolutions in a second .It implies that the speed has doubled .
Using our equation :F =
where F is the tension in the string
let the initial speed be =v then after it doubles it becomes 2v
Keeping the radius of the circle unchanged we have :
F=
From the equation it can be seen that the initial Tension has increased by a factor of 4 .
Therefore the magnitude of the tension increases to four times its original value, 4F.
Since force = mass X acceleration, then the force he excerts on the earth (aka his weight) equals his mass times the force of gravity.
Therefore
W = (66 kg) X (9.8 m/ss)
W = 646.8 kgm/ss
kg m/ss are also known as Newtons, so your answer is...
646.8 N
Answer:
I think c is the answer but I have a little concern on d too