She does work from the moment she touches the book until she lets it go. Work is anything that requires energy. Therefore, she is working as she picks up the book, carries it, and when she is lifting it onto the shelf.
Answer:
(a) 
(b) 
(c) 
Explanation:
The Planck-Einstein relation allows us to know the energy (E) of a photon, knowing its frequency (f). According to this relation, the energy of the photon is defined as:
Here h is the Planck constant.
(a)
(b)
(c)
Answer:
As voltage increases, current increases and resistance stays the same
.
Explanation:
Ohm's law gives the relationship between the voltage, resistance, and current. The mathematical form of Ohm's law is given by :
R is resistance
I is current
V is voltage
So, as voltage increases, current increases and resistance stays the same. The correct option is (A).
Remember the fact that every object has a specific amount of latent heat of vaporization
The specific heat capacity of iron and water are different
- They may have same mass but not same specific heat capacity
- So same amount of temperature can't create same amount of heat .
- Also water is liquid so heat get transmitted through out the solution.
Answer:
Submarines have tanks called ballasts. To submerge, the ballasts are filled with water. This increases the submarine's mass which also increases its density, allowing it to sink.
To rise, compressed air is used to push the water out of the ballasts. This decreases the submarine's mass which also decreases its density, allowing it to rise.
