Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
phs exam 3
| Question | Answer |
|---|---|
| Pour two liters of water at 40 degrees c into a liter of water at 20 degrees C and the final temp becomes | more than 30 degrees C |
| Which temp scale has the smallest degree | F |
| The specific heat capacity is highest for substances that absorb or release large quantities of heat for correspondingly | small temp changes |
| when an iron ring is heated, the hole becomes | larger |
| Tomatoes have a higher specific heat capacity than dough. this means that when you bite into a hot pizza | the tomato sauce feels hotter than the dough |
| temp is most closely related to molecular | kinetic energy |
| Which of the following contracts most when the temperature is decreased? Equal volumes of | helium |
| In terms of thermal expansion it is important that | the fillings in your teeth expand at the same rate as teeth |
| As a piece of metal with a hole in it cools, the diameter of the hole | decreases |
| If you measure the width of an outdoor barn with a steel tape on a very cold day, your measured width will be | a bit long |
| When you touch a hot potato with your finger, energy flows | from the potato to your finger |
| The fact that desert sand is very hot in the day and very cold at night is evidence that the specific heat capacity of sand is relatively | low |
| Materials composed of molecules that absorb large amounts of energy in the form of internal vibrations and rotations have | high specific heats |
| Aluminum has a higher specific heat capacity than iron. This means that for equal masses of aluminum and iron, the metal that heats more quickly when the same amount of heat is applied is | iron |
| a. Determine the amount of heat required to raise the temp of a 5kg piece of steel from 0 degree C to 50 degree C. The specific heat capacity of steel is 450 J/kg degree C. b. Heating 5 kg of water through the same temperature difference takes | a. Q = cm (change in) T. 10kg of steel by 100 degrees takes Q = (450 J/kg x degrees C)(5kg)(50 degrees C) = 112,500 J. b. Q= (4186 J/ kg x C)(5kg)(50 C) = 1046500 J |
| The planet Earth loses heat primarily by | radiation |
| If no molecular collisions occurred in a sample of gas, temp of the gas would | be unaffected. |
| To save energy while you leave your warm house for a half hour on a cold day, turn the thermostat | down |
| Both black and white road surfaces absorb sunlight. The warmer road surface at the end of a sunny day is the | black surface |
| Substances absorb heat energy by the process of | conduction, convection, and radiation. |
| Heat normally flows from objects of high | temperature to objects of low temperature. |
| When coal dust is spread on snow on a sunny day | more melting occurs |
| Which of these are good insulators | Feathers, wood, and snow |
| A liter of hot water will cool to room temperature faster in a | black pot |
| A red-hot piece of coal will cool quicker in a | cold room |
| Steam that issues from a pressure cooker | is invisible and cools as it expands |
| In terms of transferring heat, red-hot wooden coals | conduct poorly. |
| The higher the temp of an object. The | shorter the wavelength it radiates |
| Wood is a poor conductor | when it is cold, at common room temperature, and when it is hot. |
| Why does the direction of coastal winds change from day to night? | The high specific heat of water keeps the water cooler during the day (warmer air over the land rises and then sinks back over sea) and warmer during the night (warmer air now rises over the sea and sinks over the cooler land). |
| What happens to the volume of air as it rises? What happens to its temperature? | The temperature of the air increases and the volume of the air decreases. |
Created by:
edw13