Review for Unit 3 Assessment

A chef pours a cup of rice into a pot of boiling water and observes the rice swirling around in the pot. Which of the following explains the cause of this action?

• Heat transfer by radiation makes the rice vibrate.

• The rice is carried along by convection currents.

• The rice is carried along by conduction.

• The chef stirred the pot before the rice was added.

A student walks from inside an air-conditioned building to stand outside on a sunny, sandy beach. The student says that her face and the bottoms of her feet feel warm. Which statement best describes the thermal energy transfer taking place?

• Thermal energy is transferred to her face by radiation, and thermal energy is transferred to the bottoms of her feet by conduction.

• Thermal energy is transferred to her face by convection, and thermal energy is transferred to the bottoms of her feet by radiation.

• Thermal energy is transferred to her face by radiation, and thermal energy is transferred to the bottoms of her feet by radiation.

• Thermal energy is transferred to her face by conduction, and thermal energy is transferred to the bottoms of her feet by conduction.

A student is using a metal wire to toast marshmallows in a campfire. Which statement best explains why the wire feels hot after several minutes?

• Heat is transferred from the fire through the wire by radiation.

• Hot air from the fire is circulated by conduction.

• Heat is transferred from the fire through the wire by conduction.

• Hot air from the fire is circulated by radiation.

In 1742, Benjamin Franklin designed a wood-burning stove to heat rooms. The front of the stove was open, allowing heat to spread into the room. The back of the stove was closed, but had an air intake that increased air circulation. Fires lit in traditional fireplaces received less oxygen than those lit in Franklin stoves. If a ceramic cup is placed on top of a lit Franklin stove, it will gradually heat up. What is the mode of heat transfer from the Franklin stove to the ceramic cup?

• sublimation

• convection

• radiation

• conduction

Keyanna has left a mug of hot tea on the counter to cool off so she can drink it safely. She watches the steam rising up out of the tea. Which type of thermal energy transfer is occurring as the steam rises into the surrounding air?

• convection

• radiation

• conduction

• sublimation

A student places a cold metal nail in a cup of hot water for five minutes. When she removes the nail from the water, it feels warmer. How does the hot water affect the motion of the metal atoms in the nail?

• It causes the atoms to stop moving at all.

• It causes the atoms to vibrate slower.

• It causes the atoms to vibrate faster.

• It causes the atoms to move closer together.

A student is investigating the transfer of thermal energy. The student boils a pot of water, removes the pot from the burner, and adds ice cubes to the water. Which direction is the thermal energy flowing in this system?

• from the solid ice to the air

• from the liquid water to the solid ice

• from the liquid water to the pot

• from the solid ice to the liquid water

Which of the following types of energy transfers can take place when matter is not present?

• radiation

• heat

• conduction

• convection

As a heavy metal ball rolls down a hill, it goes faster and faster. Which statement is true?

• The ball is rapidly losing kinetic energy as it rolls down the hill.

• The ball is gaining potential energy from the hill.

• The ball will continue gaining kinetic energy until it stops.

• The ball's potential energy is changing to kinetic energy.

Noah carried a skateboard up a hill and then rode the skateboard down the hill. When Noah reached the bottom of the hill, he rolled to a stop. When did Noah have the most potential energy?

• while riding the skateboard down the hill

• while carrying the skateboard up the hill

• while standing on the skateboard at the bottom of the hill

• while standing on the skateboard at the top of the hill