Why do water droplets sometimes form on the outside of a glass of ice water?(1 point)
Responses
The temperature of the glass is cold enough to cool the air around the glass. The increasing kinetic energy of the air molecules adds water vapor to the air and forms droplets on the outside of the glass.
The temperature of the glass is cold enough to cool the air around the glass. The increasing kinetic energy of the air molecules adds water vapor to the air and forms droplets on the outside of the glass.
The temperature of the glass is cold enough to cool the air around the glass. The increasing kinetic energy of the air molecules causes water vapor in the air to undergo a state change and become a solid, which forms droplets on the outside of the glass.
The temperature of the glass is cold enough to cool the air around the glass. The increasing kinetic energy of the air molecules causes water vapor in the air to undergo a state change and become a solid, which forms droplets on the outside of the glass.
The temperature of the glass is cold enough to cool the air around the glass. The decreasing kinetic energy of the air molecules causes water vapor in the air to undergo a state change and condense into liquid, which forms droplets on the outside of the glass.
The temperature of the glass is cold enough to cool the air around the glass. The decreasing kinetic energy of the air molecules causes water vapor in the air to undergo a state change and condense into liquid, which forms droplets on the outside of the glass.
The temperature of the glass is cold enough to cool the air around the glass. The increasing kinetic energy of the air molecules causes water vapor in the air to undergo a state change and condense into a liquid, which forms droplets on the outside of the glass.
The temperature of the glass is cold enough to cool the air around the glass. The increasing kinetic energy of the air molecules causes water vapor in the air to undergo a state change and condense into a liquid, which forms droplets on the outside of the glass.
Zoe rides her bike down a steep hill and has to use the brakes a lot to keep from crashing. At the bottom of the hill, she notices that her bike’s brakes have gotten very hot. Why?(1 point)
Responses
The acceleration Zoe applied by going down the hill converted the bike’s kinetic energy into thermal energy, causing the brakes to heat up.
The acceleration Zoe applied by going down the hill converted the bike’s kinetic energy into thermal energy, causing the brakes to heat up.
The force Zoe applied by using the brakes made the bike gain so much kinetic energy that it underwent a state change, causing the brakes to heat up.
The force Zoe applied by using the brakes made the bike gain so much kinetic energy that it underwent a state change, causing the brakes to heat up.
The force Zoe applied by using the brakes converted the bike’s kinetic energy into thermal energy, causing the brakes to heat up.
The force Zoe applied by using the brakes converted the bike’s kinetic energy into thermal energy, causing the brakes to heat up.
The force Zoe applied by going down the hill increased the motion of particles in the bike chain’s oil, which caused it to undergo a state change into a gas form and stop lubricating the brakes, causing the brakes to heat up.
The force Zoe applied by using the brakes converted the bike’s kinetic energy into thermal energy, causing the brakes to heat up.
A thermometer in a glass of water shows that the temperature in the water is rising. What does this tell you about the molecules in the water?(1 point)
Responses
They have stopped moving.
They have stopped moving.
They are getting heavier.
They are getting heavier.
They are moving faster.
They are moving faster.
They are moving in a new direction.
They are moving faster.
Which of the following can be measured with a thermometer?(1 point)
Responses
the rate at which molecules are bonding
the rate at which molecules are bonding
the average potential energy of a system
the average potential energy of a system
the average kinetic energy of the molecules in a system
the average kinetic energy of the molecules in a system
the rate at which atoms are increasing in density
the average kinetic energy of the molecules in a system
Which of the following statements about energy is true?(1 point)
Responses
Energy can be created.
Energy can be created.
Energy can be converted from one form to another.
Energy can be converted from one form to another.
Energy can be destroyed.
Energy can be destroyed.
Energy comes in two forms: heat and light.
Energy can be converted from one form to another.
What energy transfer occurs when an object that’s sitting on a shelf falls to the floor?(1 point)
Responses
Kinetic energy is converted to potential energy.
Kinetic energy is converted to potential energy.
Potential energy is converted to kinetic energy.
Potential energy is converted to kinetic energy.
Thermal energy is converted to kinetic energy.
Thermal energy is converted to kinetic energy.
Sound energy is converted to potential energy.