Answer:
c. physiological reactions; convey emotional states to other members of the species
Explanation:
Darwin believed that emotional expressions began as physiological reactions that came to have evolutionary value because they convey emotional states to other members of the species. These reactions are used by many different types of species to convey various things.
The correct answer is '44'.
In fact, the atom of an element has an equal number of protons and electrons: therefore, if element X has 44 protons, it should have 44 electrons as well.
For curiosity: the chemical element with 44 protons and 33 electrons is Ruthenium.
The mosquito would have a higher pitch but quiet and the croaking bullfrog would be a lower pitch but loud.
Answer:
3. Kinetic energy of the system is maximum when potential energy is minimum.
Explanation:
Given that
Mass of block= m
Spring constant =K
Table is friction less.
As we know that in oscillatory motion ,when kinetic energy is maximum then potential energy will become minimum.
At the mean position:
Kinetic energy is maximum.
Potential energy is minimum.
At the extreme position:
Kinetic energy is minimum.
Potential energy is maximum.
At the mean position velocity of block will be maximum that is why it have maximum kinetic energy and at the extreme position the velocity of block will be minimum that is why it have minimum kinetic energy.
So from above we can say that kinetic energy of the system is maximum when potential energy is minimum.
