Answer:
Explanation:
The fact is that there exists no temperature change until a phase change is complete. That is to say, during a phase change, the energy that will be supplied is used only to separate the molecules. There is no part of it is used to increase the kinetic energy of the molecules. So its temperature will not rise, not really, since the kinetic energy of the molecules remains the same. Also, it should be noted that the average kinetic energy of the molecules does not change at the moment that melting occurs, thus the temperature of the molecules does not change.
Answer:
no 2 A graph with the x axis labelled X and Y axis labelled Y
Answer:
Assumption: the acceleration of this bus is constant while the brake was applied.
Acceleration of this bus: approximately
.
It took the bus approximately
to come to a stop.
Explanation:
Quantities:
- Displacement of the bus:
. - Initial velocity of the bus:
. - Final velocity of the bus:
because the bus has come to a stop. - Acceleration,
: unknown, but assumed to be a constant. - Time taken,
: unknown.
Consider the following SUVAT equation:
.
On the other hand, assume that the acceleration of this bus is indeed constant. Given the initial and final velocity, the time it took for the bus to stop would be inversely proportional to the acceleration of this bus. That is:
.
Therefore, replace the quantity
with the expression
in that SUVAT equation:
.
Simplify this equation:
.
Therefore,
.
In this question, the value of
,
, and
are already known:
Substitute these quantities into this equation to find the value of
:
.
(The value of acceleration
is less than zero because the velocity of the bus was getting smaller.)
Substitute
(alongside
and
) to estimate the time required for the bus to come to a stop:
.
Work = (force) x (distance)
Each time she lifts the weight, she does
(550 N) x (0.5 m) = 275 joules of work against gravity.
Each time she lets the bar down gently, gravity does
(550 N) x (0.5 m) = 275 joules of work against her muscles.
If the human physical muscular system were 100% efficient, and capable
of absorbing work as well as spending it, then the bodybuilder would do
exactly zero work in the process of 1-up followed by 1-down.
The time period of the pendulum is affected by the acceleration due to gravity. The tension does not have any effect on the time period of the pendulum and also the mass of the bob does not effect the time period of the pendulum.

Hence, if the gravity increases then the time period of the pendulum will decreases and it will swing faster.