Answer:
Nine times
Explanation:
= Initial compression of the spring = 8 cm = 0.08 m
= Final compression of the spring = 24 cm = 0.24 m
= Spring constant of the spring
Initial spring energy is given as
Initial spring energy is given as
A
Because leading zeros don’t count
Answer:
The farther star will appear 4 times fainter than the star that is near to the observer.
Explanation:
Since it is given that the luminosity of the 2 stars is same thus they radiate the same energy per unit time
Consider a spherical wave front of energy 'E' that leaves both the stars (Both radiate 'E' as they have same luminosity)
This Energy is spread over the whole surface area of sphere Thus when the wave front is at a distance 'r' the energy per unit surface area is given by
For the star that is twice away from the earth the distance is '2r' thus we will receive an energy given by
Hence we sense it as 4 times fainter than the nearer star.
If an atom has eight valence electrons, it means the atom is stable. Anything less and it will lose or gain electrons to become stable. So because this atom is full, it is not necessary to form chemical bonds. Glad I could help! :D
Answer:
Part a)
R = 9.93 ohm
Part b)
P = 2375 W
Explanation:
Part a)
Resistance of the toaster is given as
here we know that
P = power of device
V = voltage across the device
now we have
Part b)
when microwave fails and replaced
then here the current flowing in toaster is given as
similarly current in the microwave is given as
now total current in it is
So power rating is given as