**PLEASE PROVIDE STEP-BY-STEP APPROACH TO SOLVING ALL (POINTS WILL NOT BE AWARDE
ID: 1268789 • Letter: #
Question
**PLEASE PROVIDE STEP-BY-STEP APPROACH TO SOLVING ALL (POINTS WILL NOT BE AWARDED OTHERWISE)
5.Express 14 degrees F in degrees C.
A)57degrees C
B)46 degrees C
C)-10 degrees C
D)-18 degrees C
6. On his honeymoon, James Joule attempted to explore the relationships between various forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc. What maximum temperature rise would one expect for a waterfall with a vertical drop of 20m?
A)0.047 degrees C
B)0.053 degrees C
C)0.071 degrees C
D)0.064degrees C
7. Calculate the pressure exerted on the ground by a 65 kg person standing on one foot. Assume that the bottom of the person's foot is 13 cm wide and 28 cm long.
A) 1.8x10^3
B) 4.3x10^4
C) 1.7x10^4
D) 3.9x10^4
8.How much heat must be added to a 2kg block of ice at -25 degree C to change it to water at 12degree C?
A)230 kcal
B)210 kcal
C)200 kcal
D)74 kcal
E)49 kcal
Explanation / Answer
5.
C)-10 degrees C
6.
Let's start off with some basic equations:
Potential Energy = PE = m*g*h
Heat Energy = HE = c*m*dT
m = mass
g = the acceleration of Earth's gravity [9.81m/s^2]
h = the difference in height [20m]
c = Specific Heat Capacity of Water [4.186 J /(g*degreeC)]
dT = the difference in Temperature
Now we need to make some assumptions:
1) The velocity of the water at the top of the water fall is the same as the velocity at the bottom
2) The specific heat capacity of water is constant
3) There is no heat loss to the surroundings
4) There is no work done by the system or done on the system
Time for the solution:
I will denote units in [] brackets
PE = HE ==> m*g*h = c*m*dT ==> g*h = c*dT
9.81[m/s^2] * 20[m] = 4.186[J/g/degreeC] * [N*m/J] * [kg*m/N/s^2] * 1000[g/kg] * dT
Solving for dT,
dT = 0.04687 degreeC
7.
A) 1.8x10^3
8.
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