Rita climbs a ladder to the top of a water slide, waits her turn, and then slides down the slide into a pool. Which series describes the energy changes of her actions?
a
potential → mechanical → kinetic
b
kinetic → mechanical → potential
c
kinetic → potential → kinetic
d
potential → kinetic → potential
c
kinetic → potential → kinetic
When an object is in motion, it possesses what type of energy?
a
kinetic energy
b
potential energy
c
chemical energy
d
thermal energy
a
kinetic energy
Betsy depends on her electric alarm clock every morning to get up in time for school. What energy transformation happens in Betsy's alarm clock to wake her up in the morning?
a
electrical energy is converted to sound energy
b
sound energy is converted to electrical energy
c
electrical energy is converted to thermal energy
d
chemical energy is converted to kinetic energy
a
electrical energy is converted to sound energy
An aluminum block with a temperature of 300oC is placed into 200 milliliters of water with a temperature of 20oC. Which statement best describes what will be observed in this experiment?
a
Heat will flow from the metal to the water until both are 300oC.
b
Heat will flow from the metal to the water until both are 20oC.
c
Heat will flow from the metal to the water until both are at a temperature somewhere between 20oC and 300oC.
d
Heat will flow from the metal to the water until both are at the temperature of the container.
c
Heat will flow from the metal to the water until both are at a temperature somewhere between 20oC and 300oC.
A student wants to show the transfer of heat energy without matter. Which investigation design would best help the student?
a
an investigation of conduction through collisions between particles in space
b
an investigation of radiation through a current in a fluid
c
an investigation of radiation through electromagnetic waves
d
an investigation of conduction through the movement of particles through a solid
c
an investigation of radiation through electromagnetic waves
The gravitational potential energy of an object depends on the mass of the object, the strength of the gravitational field, and which of the following relative to the ground?
a
the height of the object
b
the color of the object
c
the speed of the object
d
the shape of the object
a
the height of the object
Convection ovens are ovens that are advertised to cook food more evenly than a standard thermal oven. Which statement best explains how a convection oven works?
a
Hot air is transferred through molecule to molecule contact.
b
Hot air is transferred through density differences with cool air rising and hot air sinking.
c
Hot air is transferred through heat being radiated from a thermal burner.
d
Hot air is transferred through density differences with hot air rising and cool air sinking.
d
Hot air is transferred through density differences with hot air rising and cool air sinking.
The picture shows the solar panels that power all of the appliances in Joaquin's house.
Joaquin is using his oven to bake cookies for his family. What energy transformations occur that enable him to bake cookies?
a
light energy → electrical energy → heat energy
b
light energy → electrical energy → chemical energy
c
heat energy → light energy → heat energy
d
heat energy → chemical energy → light energy
a
light energy → electrical energy → heat energy
The diagram shows a simple pendulum.
Neglecting friction, what happens to the total mechanical energy as the pendulum swings from position A to position B?
a
It remains the same.
b
It is not conserved.
c
It increases.
d
It decreases.
a
It remains the same.
A student walks downstairs to class. Which statement correctly describes the types of energy the student has at the top of the stairs and as she walks down the stairs?
a
kinetic energy at the top of the stairs; kinetic energy as she walks down
b
kinetic energy at the top of the stairs; potential energy as she walks down
c
potential energy at the top of the stairs; kinetic energy as she walks down
d
potential energy at the top of the stairs; potential energy as she walks down
c
potential energy at the top of the stairs; kinetic energy as she walks down
When a pole vaulter reaches the top of her vault, how does her potential energy compare to her kinetic energy?
a
The kinetic energy is twice the amount of potential energy.
b
The kinetic energy and potential energy are the same.
c
The kinetic energy is greater than the potential energy.
d
The kinetic energy is less than the potential energy.
c
The kinetic energy is greater than the potential energy.
Two samples of water are prepared, one with red food coloring and one with blue. When carefully combined, the red-colored water is able to float on top of the blue-colored water. Which statement best explains this result?
a
The red-colored water is hotter and less dense.
b
The blue-colored water is cooler and less dense.
c
The blue-colored water is hotter and more dense.
d
The red-colored water is cooler and more dense.
b
The blue-colored water is cooler and less dense.