Question

Q-1) Burning and boiling are two different types of change .List 2 points of difference between them.

Q-2)Total momentum of 2 bodies remain uncharged before and after the collision .Justify this statement .

Q-3)A stone weigh 490N on a planet whose acceleration due to gravity is one half of the earth's value . Calculate .

)Mass of the stone

2)weight of the stone on earth....

Q-4)Mention 2 difference between boiling and evaporation .

2)Explain the role of temperature on the rate of evaporation with the help of an activity...

Q-5)A car acceleration uniformly from an initial velocity of 2 ms ^-1 to a final velocity of 10 ms ^-1 in 8s .It then slow down to final velocity of 4 ms^-1 in 6s . Calculate the acceleration of the car during the first 8 s and during the last 6s.?......

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Answer 1

1)Boiing property is always applicable on liquid and it has certain boiling point. While on the other hand burning is applicable for solid and objective things.

2)First off momentum = mass x velocity. You can prove the conservation of momentum (i.e. that it stays the same unless a force acts upon a body) from Newton's laws.

Force = mass x acceleration

Acceleration is the change of velocity over time so:

Force = mass x ((velocity1 - velocity2) / time)

Or:

Force = ((mass x velocity1) - (mass x velocity2)) / time

Because mass x velocity is momentum, we can say:

Force = (momentum1 - momentum2) / time

Or:

Force x time = momentum1 - momentum2

Meaning a change in momentum is caused by force multiplied by time. If there is no force (or no time for it to be applied), the left hand side of the equation is zero, meaning momentum1 = momentum2 (and therefore there is no change in momentum).

Therefore, without a force being applied for a period of time, momentum is conserved.

3)Refer to image

4)Evaporation is a phase transition from the liquid phase to vapor (a state of substance below critical temperature and critical pressure) that occurs at temperatures below the boiling temperature at a given pressure. Evaporation usually occurs on the surface. Evaporation may occur when the partial pressure of vapor of a substance is less than the equilibrium vapour pressure.

Boiling is a phase transition from the liquid phase to gas phase that occurs at or above the boiling temperature. Boiling, as opposed to evaporation, occurs below the surface. Boiling occurs when the equilibrium vapour pressure of the substance is greater than or equal to the environmental pressure. For this reason, boiling point varies with the pressure of the environment. Evaporation is a surface phenomenon whereas boiling is a bulk phenomenon.

5)Consider the motion of the car in two parts: the first 8 seconds and the last 6 seconds.

For the first 8 seconds:

v⃗ iv⃗ ftitf====2m⋅s−110m⋅s−10s8s

(4)

For the last 6 seconds:

v⃗ iv⃗ ftitf====10m⋅s−14m⋅s−18s14s

(5)

Calculate the acceleration.

For the first 8 seconds:

a===ΔvΔt10m⋅s−1−2m⋅s−18s−0s1m⋅s−2

(6)

For the next 6 seconds:

a===ΔvΔt4m⋅s−1−10m⋅s−114s−8s−1m⋅s−2

(7)

During the first 8 seconds the car had a positive acceleration. This means that its velocity increased. The velocity is positive so the car is speeding up. During the next 6 seconds the car had a negative acceleration. This means that its velocity decreased. The velocity is positive so the car is slowing down.

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Answer 2

Answer:

Refer to the attachments

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