PSCI Quiz 4 Flashcards
What is the average temperature of healthy humans on the Celsius scale?
37º
Molecules in a solid
are held in nearly fixed positions by strong attractive forces.
The averge kinetic energy of a gas is proportional to
the temperature of the gas.
When water vapor condenses to a liquid
it transfers heat to the surroundings.
The water in a swimming pool is cooler than the surrounding sidewalk because it
has a higher specific heat.
The heat needed to warm one gram of water one Celsius degree is called a
calorie
The Fahrenheit temperature reading on a cold winter day in Montana is -28 °F. What is this reading on the Kelvin scale?
240
Convert from Tf to TC then to TK.
Tc = 5/9 * ( TF - 32)
TK = TC + 273
A 1.09 kg metal head of a hammer strikes a solid rock with a velocity of 5.98 m/s. Assuming all the kinetic energy of the hammer is retained by the hammer head and converted into thermal energy, how much will the hammer head increase in temperature? Hint: watch your conversion of units!
c head = 0.147 kcal / kg°C
0.029
KE –> Heat
KE = 1/2 (mass [kg]) * (velocity [m/s])2 =Joules
Convert Joules to calories
KE * 1 cal/ 4.184 J = heat in calories
Find delta T
Q (cal.) / (m (kg) * C8 (kcal/kg ºC))
then divide by 1000 because 1kcal = 1000 calories.
How many minutes would be required for a 253 W immersion heater to heat 293 g of water from 17 °C to 85 °C? The specific heat capacity of liquid water is 1.00 cal/(g C).
5.49
heat required = Q = m Cs (Tf - Ti) *4.184 J/cal = heat or energy in Joules
P = Work / time
time = Work / Power * 1min / 60 sec
A 2.74 kg block of ice at 0.0°C is added to a picnic cooler. How much heat will the ice remove from the cooler as it melts to water at 0.0°C? The latent heat of fusion of ice is 80.0 cal/g. Provide your answer in kcal (kilocalories or Calories).
219.2
Q (Heat) = mass * latent heat of fusion = m * Lv
Q = mass (kg) * (1000 g / 1 kg) * 80.0 cal / g * (1 kcal / 1000 cal) =
