Classify each of the following chemical reactions. Upper S plus upper O Subscript 2 right arrow upper S upper O subscript 2. Upp
er C a upper C l subscript 2 plus 2 upper A g upper N upper O subscript 3 right arrow upper C a (upper n upper O subscript 3) subscript 2 plus 2 upper A g upper C l. Upper Z n plus upper C u upper S upper O subscript 4 right arrow upper C u plus upper Z n upper S upper O subscript 4. 2 upper N a subscript 2 upper O right arrow 4 upper N a plus upper O subscript 2.
1 answer:
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The amount of power change if less work is done in more time"then the amount of power will decrease".
<u>Option: B</u>
<u>Explanation:</u>
The rate of performing any work or activity by transferring amount of energy per unit time is understood as power. The unit of power is watt
Here this equation showcase that power is directly proportional to the work but dependent upon time as time is inversely proportional to the power i.e as time increases power decreases and vice versa.
This can be understood from an instance, on moving a load up a flight of stairs, the similar amount of work is done, no matter how heavy but when the work is done in a shorter period of time more power is required.
Answer:
v = 12.1 m/s
Explanation:
- When at the top of the circle, there are two forces acting on the combined mass of the rider and the motorcycle.
- These are the force of gravity (downward) and the normal force, which is directed from the surface away from it, perpendicular to the surface.
- In this case, as the motorcycle runs in the interior of the circle, at the top point this force is completely vertical, and is also downward.
- Since the motorcycle is moving in a vertical circle, there must be a force, keeping the object moving around a circle.
- This force is the centripetal force, aims towards the center of the circle, and is just the net force aiming in this direction at any point.
- At the top point, this force is just the sum of the normal force and the weight of the mass of the rider and the motorcycle combined, as follows (we take the direction towards the center as positive):
- Now, we know that the centripetal force is related with the tangential speed at this point and the radius of the circle as follows:
- Since the normal force takes any value as needed to make (1) equal to (2), if the speed diminishes, it will be needed less force to keep the equality valid.
- In the limit, when the motorcyvle tires barely touch the surface, this normal force becomes zero.
- In this condition, from (1) and (2), we can find the minimum possible value of the speed that still keeps the motorcycle touching the surface, as follows: