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LenKa [72]
3 years ago
15

How is temperature related to the physical change of a substance?

Physics
2 answers:
WINSTONCH [101]3 years ago
8 0
When you heat something of cool it down you don't change the substance you might change the why is looks, but it is still the same substance. For example you cool water to 0 degrees Celsius it turns into ice but it still is two parts hydrogen and one part oxygen H2O. Physical changes will change state and/or form but it will still be what it originally was on the molecular level. Hope that helped. 
natta225 [31]3 years ago
5 0

Sample Response: Temperature is a measure of the kinetic energy of particles in a substance. As temperature increases, the atoms or molecules in a substance gain energy. As temperature decreases, the particles lose energy. A change in the energy of particles causes a change in their arrangement. A change in the arrangement of particles can lead to a physical change.

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How long does it take for an 8 kg pumpkin to hit the ground if dropped from a height of 55 m.
Sati [7]

Answer:

t = 3.35 s

Explanation:

It is given that,

Mass of a pumpkin, m = 8 kg

It is dropped from a height of 55 m

We need to find the time taken by it to hit the ground.

Initial velocity of the pumpkin, u = 0

Using second equation of motion to find it as follows :

h=ut+\dfrac{1}{2}at^2\\\\t=\sqrt{\dfrac{2h}{g}} \\\\t=\sqrt{\dfrac{2(55)}{9.8}} \\\\t=3.35\ s

So, it will take 3.35 seconds to hit the ground.

7 0
3 years ago
During a certain time interval, the angular position of a swinging door is described by θ = 4.91 + 9.7t + 2.06t2, where θ is in
polet [3.4K]

Explanation:

a)

θ = 4.91 + 9.7t + 2.06t² when t = 0

θ = 4.91 rad

θ = 4.91 + 9.7t + 2.06t²

ω = dθ/dt = 9.7 + 2.06t, when t =0

ω = dθ/dt = 9.7 + 0

ω = 9.7 rad/s

α = d²θ/dt² = 2.06

α= 2.06 rad/s²

b) please use same method above for t = 2.94 s

3 0
3 years ago
6. Four people are trying to help push and lift a refrigerator up a series of stairs. Jim pushes
professor190 [17]

Answer:

Net force due to all on the refrigerator is 400 N

Explanation:

As we know that two people are pushing the refrigerator while other two people are lifting the refrigerator

So net push force on the refrigerator is given as

F = F_1 + F_2

F = 60 + 210

F_1 = 270 N

Similarly net lift force on the refrigerator is given as

F = F_1' + F_2'

F = 200 + 95

F_2 = 295 N

Now net force on the refrigerator is given as

F_{net} =\sqrt{F_1^2 + F_2^2}

F_{net} = \sqrt{270^2 + 295^2}

F_{net} = 400 N

4 0
4 years ago
If a bowler rolls the bowling ball down the alleyway with a force of 1,000N. The ball exerts a reaction force again the alleyway
exis [7]
It’s 1,000 because it stays the same
3 0
3 years ago
Read 2 more answers
the power rating of an electric lawn mower is 2200 watts. if the lawn mower was used for 30 mins, and 650 Newtons of force was u
Tasya [4]

Answer:

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Explanation:

4 0
3 years ago
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