Physics, 16.07.2019 23:00, HalpMehPlz

Study the heating curve shown. which statement is best supported by the information in the heating curve?

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first statement, "At segment T-U, the substance changes from liquid to gas and does not change temperature"

Justification:

1) Being it a heating curve, the temperature increases as you move to the right in the time axis.

2) Regarding the first statement: "At segment T-U, the substance changes from liquid to gas and does not change temperature"

It may be true: if the segment T-U is flat (not inclined), means that the temperature is not changing. In this case, the heat provided to the substance is being used to overcome the intermolecucular atraction forces, which permits the particles to get more separated and, in such way, the liquid pass to gas phase.

3) Regarding the third statement: "At segment T -U, the substance changes from a gas to a liquid and changes temperature", it cannot be true.

When a substance changes from gas to liquid, the substance realeses heat and the temperature does not change.

This is the same for any change of phase: boiling, condenstation, melting, freezing.

4) Regarding the third statement: "At segment Q-R, the substance releases heat and increases temperature", it cannot be true.

If the substance releases heat has two only possibilities: keep the temperature (while changing phase) or increasing temperature.

5) Regarding the fourth statement: "At segment Q-R, the substance absorbs heat and decreases in themperature:, it cannot be true either.

If the substance abosrbs heat has two only possibilities: keep the temperature (in case of a change of phase) or decrease temperature.

6) In conclusion, the only feasible statment is the first one.

answered: Guest

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

$_a^z\textrm{x}\rightarrow _{a-2}^{z-4}+_2^4\alpha$

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

$_a^z\textrm{x}+_{-1}^0\textrm{e}\rightarrow _{z-1}^a\textrm{y}$

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases $\gamma -radiations$ . this process does not change the mass number.

$_a^z\textrm{x}^*\rightarrow _a^z\textrm{x}+_0^0\gamma$

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as $\beta ^+$ -decay. in this the mass number remains same.

$_a^z\textrm{x}\rightarrow _{z-1}^a\textrm{y}+_{+1}^0e$

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

answered: Guest

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2

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Study the heating curve shown. which statement is best supported by the information in the heating c...