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3 years ago

3. The sum of gravitational potential energy and kinetic energy is called mechanical

Chemistry

1 answer:

SCORPION-xisa [38]3 years ago

4 0

Answer:

Explanation:

Mechanical energy = Kinetic energy + Potential energy

We shall calculate mechanical energy at different points of time .

Time Kinetic energy Potential energy mechanical energy

0 0 4 4

2 2 2 4

4 4 0 4

6 2 2 4

8 0 4 4

10 2 2 4

and so on ........

Hence we see that total mechanical energy is constant at the value of 4

at all time .

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4 years ago

12) A 17.92 g sample of copper was submerged in water, and the volume reading rose by 2.00 mL. What is the density of the copper

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Hey there!:

Mass = 17.92 g

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3 years ago

If air has a dry-bulb temperature of 2°C

Allisa [31]

Answer:

The relative humidity is 36%.

Explanation:

Relative humidity is the measure of ratio of actual vapor density to saturated vapor density in a given system. So there are different ways to measure the relative humidity in the atmosphere. One of the common ways is to measure using Psychrometer. In this instrument, two different thermometers are used as measuring device. One of the thermometer measures the humidity in dry air and another in wet air. So the difference of the temperature of dry and wet air bulb will be related to determine the relative humidity percentage. The formula to determine the relative humidity using this method is as below.

$Relative humidity=\frac{(e_{w}-[N*(1+0.00115*T_{w}*(T_{d}-T_{w}))])*100}{e_{d} }$

Also,

$e_{d}=6.112*e^{[\frac{(17.502*T_{d} )}{(240.97+T_{d} )}]}$

And,

$e_{w}=6.112*e^{[\frac{(17.502*T_{w} )}{(240.97+T_{w} )}]}$

Here e =2.718, $T_{d}$ and $T_{w}$ are the temperature at dry bulb and wet bulb temperatures, respectively.

So, the relative humidity after substituting the values of Td = 2 C and Tw = -2 C is 36%.

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3 years ago