PHYSICS HIGH SCHOOL

A glass is semifilled with liquid water and place in a room at 20 oc. after some time, part of the water evaporates. what happened to the average kinetic energy and the average potential energy of the water particles that escaped to the gas phase?

Answers

Answer 1

Answer:

Water is placed at room temperature at 20 degree C

now after some water evaporate at room temperature

so here we can say speed of water molecules will not change as the temperature is same after evaporation

as we know that total kinetic energy is given by

$KE = (f)/(2) nRT$

since temperature is same then energy will not change here

now as water evaporate to vapors then we can say that here all molecules are separated more in vapor phase so force of interaction will be less in this phase

And since potential energy depends on the force so potential energy will decrease in this phase

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what variables affect the acceleration of an object and in what matter do they affect the acceleration?

Answers

The variables that affect the acceleration of an object are

-- the object's mass
and
-- the net force acting on the object.

Acceleration = (net force) divided by (mass) .

The more mass an object has, the less acceleration it will have
in response to the same net force.

The more net force acts on an object, the more acceleration
the object will have.

What does the term “basic unit of matter” refer to?Select one of the options below as your answer:a. Atoms
b. Elements
c. Molecules

Answers

Atom is themost basic unit of matter. They are the general term used to describe pieces ofmatter. But a different kind of atom makes up an element. A combination of atom of different elements createsa molecule. For example, you have water; it has a chemical formula of H2O. If youseparate H from O, you have two atoms. Two atoms for hydrogen and one atom foroxygen. However, they are of different elements. And when you combine them toform H2O, you create a molecule. The answer is A.

A mass of gas has a volume of 4m3, a temperature of 290k, and an absolute pressure of 475 kpa. When the gas is allowed to expand to 6.5m3, it's new temperature is 277K. What's the absolute pressure of the gas after expansion?

Answers

Given:

V1 = 4m3

T1 = 290k

P1 = 475 kpa = 475000 Pa

V2 = 6.5m3

T2 = 277K

Required:

Solution:

n = PV/RT

n = (475000 Pa)(4m3) / (8.314 Pa-m3/mol-K)(290k)

n = 788 moles

P = nRT/V

P = (788 moles)(8.314 Pa-m3/mol-K)(277K)/(6.5m3)

P = 279,204 Pa or 279 kPa

A car traveling with constant speed travels 150 km in 7200 s. What is the speed of the car?

Answers

75 km/hr, so in other words 75 km per hour.

7200 s / 60 = 120 min
120 min / 60 =2 hr
so 150 km / 2 hr = 75 km per hour

Answer:

The speed of the car is $\boxed{75\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}} {{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}}$ or $\boxed{20.83\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}}$ .

Further Explanation:

Given:

The distance covered by the car is $150\,{\text{km}}$ .

The time taken by the car to cover the distance is $7200\,{\text{s}}$ .

Concept:

The speed of a car is the ratio of the distance covered by the car to the time taken by the car in covering the distance.

The expression for the speed of the car is:

$v = (d)/(t)$ …… (1)

Here, $v$ is the speed of the car, $d$ is the distance covered and $t$ is the time taken by the car.

Substitute the value of distance and time in the above expression.

$\begin{aligned}v &= \frac{{150\,{\text{km}}}}{{7200\,{\text{s}}\left( {\frac{{1\,{\text{hr}}}}{{60 * 60\,{\text{s}}}}} \right)}}\n&= \frac{{150}}{2}\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}} {{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}\n&= 75\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}} {{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}\n\end{aligned}$

The speed of the car in terms of ${{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}$ can be expressed as.

$\begin{aligned}v&=75\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}}{{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}\left( {\frac{{1000\,{\text{m}}}}{{3600\,{\text{s}}}}} \right)\n&=75 *\frac{5}{{18}}\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}\n&= 20.83\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}\n\end{aligned}$

Thus, the speed of the car is $\boxed{75\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}} {{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}}$ or $\boxed{20.83\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}}\right.\kern-\nulldelimiterspace} {\text{s}}}}$ .

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Answer Details:

Grade:Middle School

Chapter:Speed and distance

Subject:Physics

Keywords:Speed, velocity, distance, time, distance of 150 km, in 7200 s, speed of the car, ratio of distance, rate of change of distance.

Which of the following are pure substances?a. solutions
b. compounds
c. homogeneous mixtures
d. colloids

Answers

The pure substances are c. homogenous mixtures

I think it's C hope this help

Which of the following sources of energy is not renewable? wind energy
wave energy
solar energy

Answers

Answer:

all the options listed are renewable sources of energy

Explanation:

renewable sources of energy are energy sources that are easily replenished naturally such as solar energy, wind energy , wave energy even energy from rain. These sources are usually environmental friendly that non renewable energy sources

non renewable energy however, are sources of energy that will eventually run out. examples are coal, crude oil, natural gas, nuclear energy. these sources mostly pose a high risk to the environment when being used.

hope this is quite helpful?

wind energy i think, but im not for sure

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