A) the piano lost mass as it was pushed up the ramp.
B) energy was destroyed moving the piano up the ramp.
C) some of the energy required to push the piano up the ramp was used to overcome friction between the piano and the ramp.
D) the work required to push the piano up a ramp is greater because the force is the same as if it were lifted, but the distance is greater when using a ramp.
Answer:
c
Explanation:
Answer:
C) some of the energy required to push the piano up the ramp was used to overcome friction between the piano and the ramp.
Explanation:
200° Celsius
300° Celsius
400° Celsius
Boiling point is at 200° Celsius
Explanation:
Matter exists in three states:
- Solid state: the molecules of the element are fixed in their place and strongly bonded to each other - therefore, they can only vibrate around their fixed position.
- Liquid state: the molecules of the element are free to slide past each other - however, there are still intermolecular forces that keep them close to each other
Gas state: the molecules of the element are completely free to move far from each other
Evaporation is the process that occurs when a substance changes from liquid to gas state. This process occurs when the temperature of the substance reaches its boiling point.
In the graph given in this problem (find it in attachment), we observe that:
- At first, the temperature increases up to 50 Celsius; this is the solid state
- Then the temperature stops increasing --> this is the transition of phase from solid to liquid (melting), which occurs at a constant temperature of 50 Celsius (melting point)
- Then, the temperature increases again up to 200 Celsius (liquid state)
- Then the temperature stops increasing again --> this is the transition of phase from liquid to gas (evaporation), which occurs at a constant temperature of 200 Celsius, which is therefore the boiling point
- Then, the temperature increases again (gas state)
Therefore, the boiling point of the substance in this problem is
200° Celsius
Learn more about temperature:
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Answer:
B
Explanation:
200 degrees Celcius.
Answer: C) Unscrew one light. If the other lights turn off, it's a series circuit.
Explanation:
In a series circuit, all the components in the same path. The current in the entire circuit is same. The voltage drop across each component is different. If one component does not work, the entire circuit breaks and other components also stop working. On the other hand, in a parallel circuit, voltage drop across all the components is equal. Trouble in one component does not effect other components.
Hence, to check whether the lights are connected in series or in parallel, one light should be unplugged and if the other lights still work, it means they are connected in parallel otherwise in series. Thus, correct option is C) Unscrew one light. If the other lights turn off, it's a series circuit.
T or F
Explanation:
Let be the airspeed.
Let be the cross wind speed.
We know that,ground speed is the vector sum of airspeed and cross wind speed and airspeed is perpendicular to cross wind speed.
If and are two perpendicular vectors,the resultant vector has the magnitude
Given,
So,the ground speed is