Homework 11
What can one regular calorie be defined as?
DOUBLE POINTS: What is one regular calorie equivalent to in joules?
What Is: The energy that raises the temperature of one gram of H2O from 14.5 C to 15.5 C.
What Is: 4.184 Joules.
Write out the formulas for the following:
1. converting C to K
2. heating or cooling a substance
3. melting or freezing a substance
What Is:
1. add 273 or C + 273 = K
2. Q=mcΔt
3. Q=mLf
Specific Heat of Aluminum: 0.215 cal/g K
Melting/Freezing Point of Aluminum: 933 K
You have to heat up a 1.000-gram ingot of aluminum from initial temperature Ti = 853 K to its melting point, 933 K. Calculate the number of calories required for this heat up process.
DOUBLE POINTS:
Specific Heat of Aluminum: 0.5 cal/g K
Melting/Freezing Point of Aluminum: 273 K
You have 7 grams of ice with an initial temperature of 268 K and you want to raise it to the new temperature of 276 K.
Calculate the energy budget/total amount of calories.
What Is: 17.2
What Is: 599
You calibrate a set of automobile springs using a 25 kg car battery, attached to a rope that runs over a pulley, as shown in the diagram. You find that the spring is pulled out by 0.19 meters. Compute the spring constant, k, in N/m. Just type in the numeric part of your answer, to the nearest 0.1 N/m. Hint: compute the battery's weight force!
1,289.5
Fill in the blanks to these concepts:
1. The ______ is still the same even if the amplitude varies.
2. Greater applied force = greater _____.
3. The spring has ______ restoring force.
4. Further spring is pulled/pushed=______ restoring force.
What Is:
1. Wavelength.
2. Compression.
3. Internal.
4. Stronger.
The heat needed to warm one gram of liquid H2O one Kelvin is called a?
DOUBLE POINTS: A Celsius temperature of 10 C is the same as ___K.
What Is: Calorie.
What Is: 283K.
________ measured the mechanical equivalent of heat energy by correlating temperature measurements to ________.
*double points if you can guess who and what*
What Is: *James Prescott Joule and changes in gravitational potential energy.*
Substance A:
Mass-96 grams
Specific Heat-0.336 cal/g K Melting Point-807 K
Initial Temperature: 1000 K
Substance B:
Mass-74 grams
Specific Heat-0.828 cal/g K Melting Point-900 K
Initial Temperature: 1100 K
When substance A absorbs 100 calories from substance B, substance A heats up by how many calories?
What Is: 3.1
Calculate the frequency of wavelength = 379 nm light.
What Is: 792
We know that waves in a material medium, like air or water, do not cause an overall motion in the material. The motion, however, is in...
What Is: The particles of the material vibrating to and fro across their equilibrium position.
The ___________ is a gigantic application of Newton's Second Law along with calculus, trig, and stats.
DOUBLE POINTS: What is Newton's Second Law?
What Is: The Kinetic Theory of Gases.
What Is: F=ma
Heat is almost always measured during the process of...
DOUBLE POINTS: Heat transport from the sun to Earth is accomplished primarily by...
What Is: the body gaining/losing energy.
What Is: Electromagnetic Radiation.
Substance A:
Mass-51 grams
Specific Heat-0.336 cal/g K Melting Point-807 K
Initial Temperature: 1000 K
Substance B:
Mass-30 grams
Specific Heat-0.828 cal/g K Melting Point-900 K
Initial Temperature: 1100 K
Calculate the equilibrium temperature.
What Is: 1,059.2
You have a green laser that produces 581x1012 Hz. Calculate the wavelength.
What Is: 516
How do you calculate an oscillation period?
What Is:
T= 2pie*square root of L/g
The average kinetic energy of molecules of the gas is proportional to this macroscopic measure:
*double points if you can name which scale*
TRIPLE POINTS: What makes a substance easier (the lower) or harder (the higher) to heat up by one Kelvin is...
What Is: temperature *of gas in the Kelvin scale*
What Is: Specifc Heat of Solid.
Heat transported from hot sand at the beach to the soles of your feet is accomplished primarily by...
DOUBLE POINTS: In radiation, thermal energy is transported by...
What Is: Conduction.
What Is: Electromagnetic Fields.
You pour out 243g of tea with a specific heat of 1.00 cal/g K and Ti = 347 K. You sweeten it with honey with a mass of mh = 150g at a temperature of Ti = 277 K and with a specific heat of 0.64 cal/g K.
Calculate the thermal equilibrium.
What Is: 327
What is the frequency of a light source that has a wavelength of 807 nm? What is the energy of this wave?
What Is: 371.
What is the electromagnetic wave formula?
DOUBLE POINTS: What is the speed of light?
What Is: c=λf
What Is:3x108
Liquid water at 273 K (0 C) has to (give up or gain) energy in order to become ice at 273 K.
DOUBLE POINTS: In the equation Q=mcΔt, the c stands for the...
What Is: Give up.
What Is: Specific Heat.
Substance A has a mass of 45g and an initial temperature of 1000K. Substance B has a mass of 800g and an initial temperature of 1100K. Which substance cools down and which one warms up?
What Is:
Warms Up-Substance A
Cools Down-Substance B
Substance A:
Mass-30 grams
Specific Heat-3 cal/g K
Initial Temperature: 388 K
Substance B:
Mass-20 grams
Specific Heat-4.5 cal/g K
Initial Temperature: 288 K
Calculate the equilibrium temperature.
Calculate the oscillation period.
It takes 0.45 seconds to move from equilibrium to maximum extension.
Max Compression: -18
Max Extension: 18
x= 10 CM
What Is: 1.8
The metric system unit of frequency is the Hertz, abbreviated Hz, which is that same as ___ wave cycle per second.
What Is: 1.00