Answer:
Force of static friction between the two surfaces
Explanation:
When two surfaces come into contact, they exert a force that resist the sliding of the two surfaces. This force is called static friction.
This force is given by the relation
Where,
μ - coefficient of static friction
η - normal force acting on the body
When a force acts on a body placed on a rough surface, it doesn't do any work if the applied force was less than the force of static friction.
So, in order to move the body, the applied force should be greater than the force of static friction.
Energy=mass*SHC*temp change
=100*0.9*75
=6750J
Answer:
Explanation:
The energy emitted by a single photon is given by:
where
h is the Planck constant
c is the speed of light
is the wavelength of the photon
For the photons emitted by the zinc atoms,
So the energy of a single photon emitted is
And since the number of atoms is
The total energy emitted will be
The statement ‘A tertiary source is the most desirable source for a
researcher to use’ is false. It should be that your source is primary because
it is more reliable and is related to the research you have been working on.
The given reaction is an exothermic reaction due to the negative amount of enthalpy. In this case, an increase in temperature favors the backward reaction which points to the creation of more products. The expression of K or Q is products over reactants concentration. When this happens, Q becomes smaller then. Hence answer is C and 1.
