PHY 121 ALL QUIZZES QUESTIONS WITH VERIFIED
ANSWERS
What is the typical power output of the human body? - Answers - 100W
In 2018, which source of energy was greatest for the US? - Answers - Petroleum
The electric company charges your monthly electric usage in units of kilowatt-hours
(kWh). These are units of __________________ - Answers - Energy
On a daily basis, where does Earth get most of its energy? - Answers - Sunlight
A change of temperature of some object (including Earth) requires which of the
following? - Answers - Some difference between heat in and heat out
Which of the following is NOT a unit of energy? - Answers - Watts
If a reporter talks about a new power plant that produces 10 million watts per hour, what
are watts per hour a measure of? - Answers - Nothing - that reporter is just getting some
physics wrong
We have defined an energy servant as a person who can continually produce 100 W.
How many energy servants does the average person need? - Answers - 100
Per capita energy use and per capita gross domestic product are - Answers - usually
strongly correlated
An object is moving at 2 m/s. Work must be done to bring this object to rest. Why is this
work negative? - Answers - The work is negative since kinetic energy decreases.
The electric company charges you in units of kilowatt-hours. These are units of -
Answers - Energy
In energy conversion processes, we can do a sort of "bookkeeping" to keep track of
energy. Which of the following is not interchangeable with energy, and so should not
enter into the bookkeeping? - Answers - Force
Which of these processes would take more work? - Answers - pushing a book with 5 N
of force so it slides 3 meters
What effect does friction have on energy? - Answers - It lowers energy because it does
negative work.
, If the temperature of gas changes by 5 degrees C, which of the following is true? -
Answers - The temperature changes by 5 kelvins.
Consider two objects, Object A with a specific heat of 1000 J/(kg*K), and Object B with
a specific heat of 500 J/(kg*K). Both objects have the same mass. If both have 200J of
heat energy added, which will experience the larger increase in temperature? - Answers
- Object B
Units for describing the flow of heat through a window could be: - Answers - All of the
above could be used. (calories per day, Btu per month, Joules per second (or Watts))
Heat is - Answers - the transfer of energy because of a temperature difference
Water has a higher specific heat than soil. If you add equal amounts of thermal energy
to equal masses of water and soil, then - Answers - the soil will undergo the greater
temperature change.
The first law of thermodynamics states - Answers - the total energy does not change in
any energy transformation
If you place your hand in water at a temperature of 140 ºF, then heat flows from
_______ to _______ by the heat transfer method of _______. - Answers - the water;
your hand; conduction
If we know now that we have 30 billion barrels of oil in our proven reserves, this means -
Answers - Depending on the economy and technology, we could still have 30 billion
barrels of oil decades from now.
Which seems most likely? - Answers - Economic factors will determine when it is no
longer profitable to extract the last of the petroleum from the ground.
The energy in fossil fuels comes, ultimately, from - Answers - the Sun
Why are most power plants built on the water? - Answers - They need a place to put the
waste heat after electricity is generated
In a gas-powered car, what percentage of the energy from the fuel goes into actually
moving the car? - Answers - 15-20%
Which of the following statements about particulate matter is FALSE? - Answers - The
bigger the particles, the more damaging the particulate matter is.
Which of the following is NOT a consequence of acid rain? - Answers - Cancers
When we talk about particulates in conjunction with coal-burning power plants, we mean
- Answers - fine particles of unburnable products in the coal.
ANSWERS
What is the typical power output of the human body? - Answers - 100W
In 2018, which source of energy was greatest for the US? - Answers - Petroleum
The electric company charges your monthly electric usage in units of kilowatt-hours
(kWh). These are units of __________________ - Answers - Energy
On a daily basis, where does Earth get most of its energy? - Answers - Sunlight
A change of temperature of some object (including Earth) requires which of the
following? - Answers - Some difference between heat in and heat out
Which of the following is NOT a unit of energy? - Answers - Watts
If a reporter talks about a new power plant that produces 10 million watts per hour, what
are watts per hour a measure of? - Answers - Nothing - that reporter is just getting some
physics wrong
We have defined an energy servant as a person who can continually produce 100 W.
How many energy servants does the average person need? - Answers - 100
Per capita energy use and per capita gross domestic product are - Answers - usually
strongly correlated
An object is moving at 2 m/s. Work must be done to bring this object to rest. Why is this
work negative? - Answers - The work is negative since kinetic energy decreases.
The electric company charges you in units of kilowatt-hours. These are units of -
Answers - Energy
In energy conversion processes, we can do a sort of "bookkeeping" to keep track of
energy. Which of the following is not interchangeable with energy, and so should not
enter into the bookkeeping? - Answers - Force
Which of these processes would take more work? - Answers - pushing a book with 5 N
of force so it slides 3 meters
What effect does friction have on energy? - Answers - It lowers energy because it does
negative work.
, If the temperature of gas changes by 5 degrees C, which of the following is true? -
Answers - The temperature changes by 5 kelvins.
Consider two objects, Object A with a specific heat of 1000 J/(kg*K), and Object B with
a specific heat of 500 J/(kg*K). Both objects have the same mass. If both have 200J of
heat energy added, which will experience the larger increase in temperature? - Answers
- Object B
Units for describing the flow of heat through a window could be: - Answers - All of the
above could be used. (calories per day, Btu per month, Joules per second (or Watts))
Heat is - Answers - the transfer of energy because of a temperature difference
Water has a higher specific heat than soil. If you add equal amounts of thermal energy
to equal masses of water and soil, then - Answers - the soil will undergo the greater
temperature change.
The first law of thermodynamics states - Answers - the total energy does not change in
any energy transformation
If you place your hand in water at a temperature of 140 ºF, then heat flows from
_______ to _______ by the heat transfer method of _______. - Answers - the water;
your hand; conduction
If we know now that we have 30 billion barrels of oil in our proven reserves, this means -
Answers - Depending on the economy and technology, we could still have 30 billion
barrels of oil decades from now.
Which seems most likely? - Answers - Economic factors will determine when it is no
longer profitable to extract the last of the petroleum from the ground.
The energy in fossil fuels comes, ultimately, from - Answers - the Sun
Why are most power plants built on the water? - Answers - They need a place to put the
waste heat after electricity is generated
In a gas-powered car, what percentage of the energy from the fuel goes into actually
moving the car? - Answers - 15-20%
Which of the following statements about particulate matter is FALSE? - Answers - The
bigger the particles, the more damaging the particulate matter is.
Which of the following is NOT a consequence of acid rain? - Answers - Cancers
When we talk about particulates in conjunction with coal-burning power plants, we mean
- Answers - fine particles of unburnable products in the coal.
