mike's car can accelrate from 0 mph to 40 mph in 5 sec. what is the acceleration of his car miles per hour per sec?
1 answer:
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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.
<em><u>Note: There is no image to take as a reference, so I'm assuming F2 directed to the right and F1 to the left, and F2=2F1</u></em>
Answer:
<em>to the right</em>
Explanation:
<u>Net Force</u>
When several forces are applied to a particle or a system of particles, the net force is the sum of them all, considering each force as a vector. As for the second Newton's law, the total force equals the product of the mass by the acceleration of the system:
If the net force is zero, then the system of particles keeps at rest or at a constant velocity.
The system of particles described in the question consists of two objects of masses m1=M and m2, where
Two forces F1=F and F2 act individually on each object in opposite directions and
We don't get to see any image to know where the forces are applied to, so we'll assume F2 to the right and F1 to the left.
The net force of the system of particles is
The mass of the system is
Thus, the acceleration of the center of mass of the system is
Since F2 is greater than F1, the direction of the acceleration is to the right.
Note: If the forces were opposite than assumed, the acceleration would be to the left