Place the object in an electronic balance and measure its mass.
Place a measured amount of water in the cylinder.
Place the object in the cylinder so that it’s fully submerged.
Measure the new level of the liquid and subtract the original level. This is equal to the volume of the object.
Density = mass / volume.
#3). The wavelengths of the four types of electromagnetic
radiation on that list line up like this:
Longest ... microwaves
next . . . . . infrared waves
next . . . . . visible light waves
shortest ... ultraviolet waves
#4). The word "visible" means "able to be seen". Infrared
light and ultraviolet light are not visible to human eyes.
Answer:
See the explanation below
Explanation:
The speed of sound waves can be calculated using the following equation:
![v_{s}=\sqrt{\frac{E}{ro} } \\where:\\E = Young's modulus [GPa]\\ro = density of the material [kg/m^3]](https://tex.z-dn.net/?f=v_%7Bs%7D%3D%5Csqrt%7B%5Cfrac%7BE%7D%7Bro%7D%20%7D%20%5C%5Cwhere%3A%5C%5CE%20%3D%20Young%27s%20modulus%20%5BGPa%5D%5C%5Cro%20%3D%20density%20of%20the%20material%20%5Bkg%2Fm%5E3%5D)
Let's do the exercise of comparing two materials one denser than the other, as is steel and aluminum
ro_steel = 7500 [kg/m^3]
ro_aluminum = 2700 [kg/m^3]
E_steel = 200 [GPa]
E_aluminum = 70 [GPa]
Now replacing the values in the equation for each material.
![v_{steel}=\sqrt{\frac{200*10^9}{7500}}\\ v_{steel}=5163[m/s]](https://tex.z-dn.net/?f=v_%7Bsteel%7D%3D%5Csqrt%7B%5Cfrac%7B200%2A10%5E9%7D%7B7500%7D%7D%5C%5C%20v_%7Bsteel%7D%3D5163%5Bm%2Fs%5D)
And for the aluminum
![v_{aluminum}=\sqrt{\frac{70*10^9}{2700} }\\ v_{aluminum}=5091.75[m/s]](https://tex.z-dn.net/?f=v_%7Baluminum%7D%3D%5Csqrt%7B%5Cfrac%7B70%2A10%5E9%7D%7B2700%7D%20%7D%5C%5C%20v_%7Baluminum%7D%3D5091.75%5Bm%2Fs%5D)
In this way we can see that sound propagates faster in denser materials.
Answer:
The process of producing electric energy or the amount of electric energy produced by transforming other forms of energy into electrical energy; commonly expressed in kilowatt-hours (kWh) or megawatt-hours (MWh). Electric power plant efficiency η is defined as the ratio between the useful electricity output from the generating unit, in a specific time, and the energy value of the energy source supplied to the unit in the same time period. For electricity generation based on steam turbines 65% of all prime energy is wasted as heat. The maximum theoretical energy efficiency is defined in more detail by the Rankine cycle. For modern practical systems this is about 40% but less for older generating plant. The efficiency falls still further if fuels with lower energy content such as biomass are used to supply the plant. The economics of power generation based on reciprocating engines depends to a large extent on the use to which the engine is to be put. The cheapest engines available are small petrol-driven engines based on car engines, which are manufactured in large numbers each year.
Explanation:
