Answer:
Storing it at a temperature greater than its Curie temperature will demagnetize it. The Curie temperature--named after the French scientist Pierre Curie--is the temperature at which magnets lose their permanent magnetism. ... Samarium cobalt, neodymium, and ceramic/ferrite magnets are brittle.
Answer:
VR = 0.26 m/s
Explanation:
m = 0.1 kg M = 0.1 kg
v = 0.31 m/s Vi = 0 m/s
the kinetic energy of the system initially is:
Ki = 1/2×m×(v^2) + 1/2×M×(Vi)^2
= 1/2×(0.1)×(0.31)^2
= 4.805×10^-3 J
then, we told that the system after collision only retains a fraction 0.69 of its initial kinetic energy. that is the final kinetic energy of the system is:
Kf = 0.69×4.805×10^-3 J
= 3.31545×10^-3 J
but due equal masses of the bodies, we know that after the collision the only body that would be in motion would be the body that at res and the body that was initially moving will now be at rest.so the kinetic energy is only made by the second body and given by:
Kf = 1/2×M×(VR)^2
3.31545×10^-3 = 1/2×(0.1)×(VR)^2
VR^2 = 0.066309
VR = 0.26 m/s
according to the coservation of linear momentum:
You must know the concept of pH of a solution and its relation to the concentration of H+ and OH- ions. pH is a measure of the substance's acidity or basicity. From the definition of Arrhenius, an acid contains an H+ while a base contains a OH- ion. From this definition, we can say that an acidic substance has a higher concentration of H+ ions. Now, I'll introduce here that pH is the value of the negative logarithm of the concentration of H+. In equation,
pH = -log[H+]
The term pOH is therefore also, pOH = -log[OH-]. Therefore, the relationship that connects the two negative logarithms is:
pH + pOH = 14
The pH scale starts from 1 being the most acidic to 14 being the most basic. The neutral pH is 7. Thus, for a pH of 7, the H+ and the OH- concentrations are equal.
pH = 7 = -log[H+][H+] = 1×10⁻⁷ mol/L = [OH-]
Since the concentrations are equal, the ratio is equal to 1.
Answer:
The professor should be 
away of the impact point, walking towards it.
Explanation:
We will calculate how much time an egg takes to fall from the initial position to the final position, and then use that time to calculate how much distance the professor moved.
We use the equation for accelerated motion (on the vertical direction):
Since it departs from rest and the acceleration is that of gravity, we have:
Which means:
Having the ground as reference and taking the upwards direction as positive, for our values we have:
And in that time the professor moved 
