Period 5 Exercises Answers
E.1 An increase in the temperature of a solid usually a) decreases the average molecular separation. b) c) causes the molecules to melt. increases the average molecular separation.
d) causes the electrons to transfer to lower en
Activity 2 Solutions: Electromagnetic Waves Radiant Energy I
How Do Electromagnetic Waves and Other Waves Transmit Energy?
Your instructor will discuss the properties of waves. Transferring energy with waves a) Stretch a slinky along the l
Name: _ Section: _
Activity Sheet 5: Thermal Energy, the Microscopic Picture
5.1 How Is Temperature Related to Molecular Motion?
a) At a particular temperature, do all of the molecules move at the same speed? b) How does the average speed of molec
Period 9 Exercise Answers
E.1 In chemical reactions, the amount of mass that might be converted into energy is very small. In nuclear reactions this is not the case. This is because the binding energy in chemical bonds a) is much larger than the binding e
Preview of Period 9: Energy and Mass
9.1 Einstein's Equation, E = Mc2 What happens to the mass of a substance that gains or loses energy? 9.2 Nuclear Processes How can an atom's nucleus change? What is the difference between physical, chemical, and nuclea
Period 10 Exercise Answers
E.1 Alpha particle radiation is a) emission of electrons from radioactive material. b) high energy photons from outer space. c) made up of neutrinos and antineutrinos. d) emission of helium nuclei from radioactive material. e) m
Preview of Period 10:
10.1 Ionizing Radiation What types of particles are emitted when radioactive atoms decay? 10.2 How is Ionizing Radiation Detected? Why does the Geiger counter measure counts when no radioactive source is placed nearby? 10.3 Nuclear D
Period 11 Exercise Answers
E.1 Comparing alpha and beta radiation of the same energy, a) alpha is more ionizing and more penetrating. b) alpha is more ionizing and less penetrating. c) alpha is less ionizing and more penetrating.
d) alpha is less ionizing
Preview of Period 11: Ionizing Radiation II
11.1 How Is Ionizing Radiation Detected?
What do you see in the cloud chamber? What other methods do we have for detecting ionizing radiation? 11.2 What Natural Sources of Radiation are Present?
Are these source
Period 12 Answers
E.1 Which of the following statements about fundamental forces is FALSE? a) At any energy level, the strengths of the strong, weak, and electromagnetic forces are equal. b) The strong nuclear force is involved in binding quarks into neut
Preview of Period 12: Nuclear Reactions
12.1 Nuclear Binding Energy How can the binding energy of a nucleus be estimated from a binding energy graph? 12.2 Mass as a Form of Energy
How can the binding energy of a nucleus be calculated? 12.3 Particle Accele
Preview of Period 8: Chemical Energy
8.1 8.2 8.3 8.4 Atoms, Elements, and Compounds What are the chemical components of matter? The Electromagnetic Force What holds atoms and molecules together? Chemical Reactions and Equations How do you write a balanced
Period 3 Exercise Answers
E.1 An electron absorbs a photon that has 5.0 x 1021 joules of energy and the electron moves to a higher energy level. The electron later drops to a lower energy level and emits a photon that has 3.3 x 1022 joules of energy. How
Preview of Period 3: Electromagnetic Waves Radiant Energy II
3.1 Radiant Energy from the Sun How is light reflected and transmitted? What is polarized light? 3.2 Energy Transfer with Radiant Energy How can electromagnetic waves transfer energy and informa
Period 4 Exercise Answers
E.1 A practical handle for a hot pan can be made from each of the following EXCEPT a) b) c) d) e) a poor conductor of heat. a thermal insulator. plastic. wood. silver.
E.1 = e
E.2 In order for thermal energy to be transferred bet
Preview of Period 4: Transfer of Thermal Energy
4.1 Temperature and Thermal Energy How is temperature measured? What temperature scales are used? 4.2 How is Thermal Energy Transferred? How do conduction, convection, and radiation energy transfer differ? 4
Preview of Period 5: Thermal Energy, the Microscopic Picture
5.1 Temperature and Molecular Motion What is evaporative cooling? 5.2 Temperature and Phase Changes How much energy is required for a phase change? What is the difference between heat capacity,
Period 6 Exercise Answers
E.1 In a closed container the motion of the molecules of a gas at room temperature is an example of a) b) c) d) static order. static disorder. dynamic order. dynamic disorder.
E.1 = d E.2 Which of the following statements about t
Preview of Period 6: Entropy
6.1 Order, Disorder and Entropy What defines an "orderly" pattern? What is entropy? Why does it increase? 6.2 Equilibrium and the 2nd Law of Thermodynamics Why do systems go toward equilibrium? What is the 2nd Law of Thermodyn
Period 7 Exercise Answers
E.1 Which one of the following statements is TRUE?
a) In any physical process that uses
energy to do work, all the energy will
be transformed into useful work if we
wait long enough.
b) If we could construct a frictionless heat
Preview of Period 7: Applications of the Laws of Thermodynamics
7.1 Conservation of Energy and the 1st Law of Thermodynamics How does conservation of energy relate to molecular motion? What is the 1st Law of Thermodynamics? 7.2 Ideal Gas Law How are press
Period 8 Exercise Answers
E.1 When in our classroom demonstration ammonium nitrate was dissolved in water, the temperature of the water decreased. This shows that a) an exothermic reaction occurred. b) an endothermic reaction occurred. c) the reaction use
Period 13 Exercise Answers
E.1 Why did the condensation of the gravitational force 1043 seconds after the Big Bang contribute to the cooling of the Universe? a) The gravitational force caused particles to expand rapidly in a process called the sudden expa
Preview of Period 13: Astrophysics
13.1 What is the origin of matter?
How did matter form following the Big Bang? 13.2 How did galaxies form?
Why did matter clump together into galaxies? 13.3 What is composition of stars?
How can the chemical composition
Physics 21: Lecture 8
Other Forms of Energy
Relation between Forms
Last time: Work = e.g. =
It costs Energy (J=Nm) to move against a force
We see that raising an object in
Physics 21: Lecture 7
Gravity and Orbits
Energy and Work
Newtons Law of Gravitation
| | = =
Gravitational Force Near the Earth
Since we can mentally replace the Earth with a point of
Physics 21: Lecture 6
We have dinstinguished inertial reference frames
(a=0, i.e. Constant v, special case v=0)
Non-inertial reference frames, with acceleration
In an accelerated f
Physics 21: Lecture 5
`Strings and Springs
Discussion of 3rd Law
Hookes Law (Text Sect 6.4, Ch 9)
Car Colliding with a Car
Car A hits Car B (of equal mass) head-on. The
magnitude of the force exerted by Car A on
Car B i
Physics 21: Lecture 4
Newtons Laws of Motion, part 2
Friction, Various Forces
Newtons 2nd Law does not tell us what the forces are. It only
tells us how an object responds that is subject to forces; i.e.
the object a
Physics 21: Lecture 3
Acceleration and Forces
Newtons Laws and Forces
We have studied the motion of an object that
undergoes a constant acceleration
Example: an object in free-fall near the surface of
the earth = g = 9.8 2