1 Table Exercise the object released from atop of building house of heigh 10m . Calculaie a final velocity if it time is 4s
1 answer:
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Answer:
Explanation:
Impulse on an object is given by .
However, it's also given as change in momentum (impulse-momentum theorem).
Therefore, we can set the change in momentum equal to the former formula for impulse:
.
Momentum is given by . Because the truck's mass is maintained, only it's velocity is changing. Since the truck is being slowed from 26.0 m/s to 18.0 m/s, it's change in velocity is 8.0 m/s. Therefore, it's change in momentum is:
.
Now we plug in our values and solve:
(two significant figures).
The consistent temperature indicated by section 2 represents the flow of energy lost as the water freezes.
Section 2 indicates that energy is being utilized to bring all molecules to the melting point.
Section 4 indicates that the temperature is stable until all molecules reach the boiling point.
The increasing temperature in section 5 indicates that molecular motion is increasing.
Explanation:
The figure is missing: find it in attachment.
The graph represents the temperature of a block of ice as heat is continuously supplied to it.
At the beginning (section 1), the temperature increases: in this phase, the heat supplied to the ice is used to increase the kinetic energy of vibration of the molecules of ice.
When the ice reach point A (melting point), the ice starts to melt. In this phase (section 2), the temperature of the substance remains constant, because all the heat supplied is used to break the bonds between the molecules, converting the ice into liquid water.
At point B, the ice has completely melted, and therefore we now have liquid water.
In sector 3 (between B and C), the temperature of the water increases again as we supply more and more heat: this heat, in fact, is used to increase the kinetic energy of the molecules, which move faster and faster.
Then, the water reaches the boiling point (point C): after that, the water starts to boil, (sector 4) and the heat supplied is entirely used to remove the intermolecular forces between the molecules of water; as a result, the temperature remains constant during the process.
At poind D, the water has completely boiled, and converted into gas state (steam).
After that, the temperature of the steam starts to increase again (sector 5) as more and more heat is supplied, because it is used to increase the kinetic energy of the molecules.
Therefore, the correct statements are:
The consistent temperature indicated by section 2 represents the flow of energy lost as the water freezes.
Section 2 indicates that energy is being utilized to bring all molecules to the melting point.
Section 4 indicates that the temperature is stable until all molecules reach the boiling point.
The increasing temperature in section 5 indicates that molecular motion is increasing.
Answer:
The speed of the plank relative to the ice is:
Explanation:
Here we can use momentum conservation. Do not forget it is relative to the ice.
(1)
Where:
- m(g) is the mass of the girl
- m(p) is the mass of the plank
- v(g) is the speed of the girl
- v(p) is the speed of the plank
Now, as we have relative velocities, we have:
(2)
v(g/b) is the speed of the girl relative to the plank
Solving the system of equations (1) and (2)
I hope it helps you!