An example of kinetic energy is ______.
a stretched rubber band
boulder perched on the edge of a cliff
car coming to a stop
A: The table tennis ball represents the Milky Way and the volleyball represents the local group cluster.
The universe is huge. It contains millions of billions stars in total of about 10 billion galaxies. These galaxies are grouped into clusters. Milky way is our home galaxy which is part of local group cluster. There are main three galaxies in local group cluster- Milky way, Andromeda and Triangulum. Other than these large galaxies there are dwarf galaxies part of the cluster.
Thus, a table tennis ball which is smaller in size would represent milky way and volley ball would represent local group cluster.
A rod made up of a single element that is used to heat water is made of nichrome ( Nichrome is an alloy of nickel and chromium, which has majority of nickel in it about 80% and 20% is chromium). Since, the majority is of nickel, nickel is a transition element belonging to D- Block in the periodic table and is found in 10th group. Nickel is ferromagnetic element. It is also used widely in stainless steel.
The calculated value of the efficiency of the light bulb be 75 %.
Efficiency is essentially a measurement of the amount of labor or energy that can be saved throughout a process. In other words, it's similar to comparing the energy input and output in any particular system.
For instance, we observe that many processes result in the loss of effort or energy like vibration or waste heat.
As a result, the energy efficiency is the energy output divided by the energy intake, which is then expressed in percentage form.
According to the question:
The 30 W light bulb uses electrical energy as input energy: I = 600 J.
The 30 W light bulb produces light energy as output energy: O = 450J.
Hence, the efficiency of the light bulb is given by
= output energy/ input energy×100%
= 450J/600J ×100%
= 75 %
Hence, the efficiency of the light bulb be 75 %.
Learn more bout efficiency here: