A particle starts at the origin and moves away from it in a straight line. After 1.6 seconds, it is 12.8 meters from the origin.
1 answer:
Answer:
Average velocity of the particle is
Explanation:
Average velocity is defined as the total velocity divided by the total time. It is given by the equation
In the given problem the particle starts from origin, travels and then reverses direction and travels till
within a total time of
Displacement is defines as the shortest distance between initial and final point.
Here displacement =
total time=
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Answer: 2. Solution A attains a higher temperature.
Explanation: Specific heat simply means, that amount of heat which is when supplied to a unit mass of a substance will raise its temperature by 1°C.
In the given situation we have equal masses of two solutions A & B, out of which A has lower specific heat which means that a unit mass of solution A requires lesser energy to raise its temperature by 1°C than the solution B.
Since, the masses of both the solutions are same and equal heat is supplied to both, the proportional condition will follow.
<em>We have a formula for such condition,</em>
.....................................(1)
where:
= temperature difference
- Q= heat energy
- m= mass of the body
- c= specific heat of the body
<u>Proving mathematically:</u>
<em>According to the given conditions</em>
- we have equal masses of two solutions A & B, i.e.
- equal heat is supplied to both the solutions, i.e.
- specific heat of solution A,
- specific heat of solution B,
&
are the change in temperatures of the respective solutions.
Now, putting the above values
Which proves that solution A attains a higher temperature than solution B.