Answer:
a) 201.11minutes
b) 223.75minutes
Explanation:
Heat energy is defined as the energy required to change the temperature of a substance by 1kelvin.
It is expressed as H = mc∆t where m is the mass of the water
c is the specific heat capacity of the water/ice
∆t is the change in temperature
Total heat required to melt the ice
H = mLice + mc∆t
Lice is the latent heat of fusion of ice
a) To calculate how much time tmelts passes before the ice starts to melt, we will only calculate heat energy absorb by the ice before it melts.
H = mLice
H = 0.55(334000)
H = 183,700Joules
If heat is supplied to the container at the constant rate of 900 J/minute, the time taken before the ice starts to melt will be:
t = 183700/900
t = 201.11minutes
b) To calculate how much time trise does it take before the temperature begins to rise above 0°C, we will calculate the total energy absorbed at 0°C first.
H = 0.55(334000) + 0.55(2100)(0-(-15.3)
Note that the ice melts at 0°C which will be the final temperature
H = 183700+17671.5
H = 201,371.5Joules
Since heat is supplied to the container at the constant rate of 900 J/minute
900Joules = 1minute
201,371.5Joules= x
900x = 201,371.5
x = 201,371.5/900
x =223.75minutes
The time taken before the temperature begins to rise is 223.75minutes
Answer:
The work remains the same
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The sentence can be completed as follows:
<span>The motion of an object moving with uniform circular motion is always tangential to the circle, so the speed of an object moving in a circle is known as tangential speed.
The object moves by uniform circular motion due to the presence of a force (called centripetal force) pointing toward the center of the circle. Due to the presence of this force, the object experiences an acceleration (called centripetal acceleration) that makes the object turning in a circle. This centripetal acceleration changes only the direction of the velocity of the object, not its magnitude, which is called tangential speed and it is constant.</span>