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3 years ago

Explain the Construction of the mercury barometer

Physics

1 answer:

boyakko [2]3 years ago

6 0

Answer:

The basic construction, unchanged since Torricelli's experiment in 1643, is a glass tube about three feet long, closed at one end, filled with mercury, and inverted with the open end immersed in a cistern of mercury.

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How are fossil fuels different from renewable energy sources?

BaLLatris [955]

The difference between the two isn’t as complicated as you may think. Renewable energy comes from natural resources that can be replenished during an average human lifetime and includes the following types of power:
Solar
Wind
Hydro
Geothermal
Biomass
Fossil fuels, on the other hand, can take thousands—or even millions—of years to naturally replenish:
Natural gas
Coal
Oil
These distinctions may seem cut-and-dried, but there are some gray areas. Natural gas is often labeled as “clean power” because it burns cleaner than coal. Folks may even believe that natural gas is a sustainable resource. Don’t be fooled. natural gas is a fossil fuel that emits CO2 when burned. In the case of biomass, things also get a bit more complicated. Burning wood—the most common method of biomass energy generation—sometimes emits more CO2 than burning coal. That said, wood is classified as a renewable resource by a lot of scientists because trees can be replenished.

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4 years ago

What happens to light waves from a star as the star moves toward Earth?

Musya8 [376]

This shifts the star’s spectral lines toward the blue end of the spectrum. If the star is moving away from us, it’s waves are effectively stretched out when they reach earth, increasing their wavelength. This shifts the star’s spectral lines toward the red end of the spectrum.

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4 years ago

Read 2 more answers

If you were to measure the width of your lab manual with a meter stick, and then the length (roughly 50% longer), by what fracti

Leona [35]

Answer:

Explanation:

a ) Let breadth be L , then length will be 1.5 L

Since it is a meter scale , the least count is 1 m.m. So

maximum possible error in a measurement is 1 mm.

In both the measurement of length and breadth , absolute

uncertainty will be 1mm.

Hence there is no difference in absolute uncertainty of their measurement.

b ) percent uncertainty in the measurement of length

$\frac{1 mm}{1.5L\times1000} \times100$

= 1 / 15L%

percent uncertainty in the measurement of breadth

$\frac{1 mm}{L\times1000} \times100$

1 / 10L%

In breadth it will be higher by

( 1/10L - 1/15L)/ 1/10L

= 1/3

c ) Uncertainty in the measurement of R= 1 %

Area A = π R²

ΔA/A X100 = 2 X ΔR/R X 100

Percentage uncertainty in A = 2 X percentage uncertainty in R

= 2 X 1

=2 %

Therefore percentage accuracy in the calculation of area

= 2 %.

7 0

3 years ago

Which phase comes after waxing crescent moon

12345 [234]

Answer:

new moon

Explanation:

6 0

3 years ago

Which graph accurately shows the relationship between kinetic energy and speed as speed increases?

mixer [17]

Answer:

Explanation:

kinetic energy (KE) is the energy possessed by moving bodies. It can be expressed as:

KE = $\frac{1}{2}$ m $v^{2}$

Where: m is the mass of the object, and v its speed.

For example, a stone of mass 2kg was thrown and moves with a speed of 3 m/s. Determine the kinetic energy of the stone.

Thus,

KE = $\frac{1}{2}$ x 2 x $3^{2}$

= 9

KE = 9.0 Joules

Assume that the speed of the stone was 4 m/s, then its KE would be:

KE = $\frac{1}{2}$ x 2 x $4^{2}$

= 16

KE = 16.0 Joules

Therefore, it can be observed that as speed increases, the kinetic energy increases. Thus option B is appropriate.

3 0

3 years ago

Explain the Construction of the mercury barometer ​

Explain the Construction of the mercury barometer