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by BlastRoom
Identify and explain the three modes of thermal energy transfer.
#physics
40 questions
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More correct answers pulls the rope your way.
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Answer, then tap to leap the frozen ridge.
An astronaut on a spacewalk feels the Sun-facing side of her suit warm while there is no air between the Sun and the suit. Which mode transfers energy to the suit?
A metal spoon is left in hot soup, and after a minute the handle above the bowl is warm even though no soup touched it. Which mode carried energy through the spoon?
A pot of water is heated from below; warmer water from the bottom moves upward while cooler water sinks toward the bottom. Which mode is moving energy through the water?
An ice cube melts faster on a room-temperature aluminum tray than on a room-temperature plastic cutting board. Which mode transfers energy from the tray into the ice at the contact surface?
A hot-air balloon's burner heats air inside the envelope, and that air moves upward while cooler air shifts downward near the opening. Which mode is described?
A black asphalt path becomes hot after several hours of direct sunlight, even before anyone touches it. Which mode brings most of that energy from the Sun to the path?
A copper rod has one end in a flame; the far end soon becomes too hot to hold, while the rod as a whole stays in place. Which mode carries energy along the rod?
In a room with a baseboard heater, air near the floor becomes warmer, moves upward, and is replaced by cooler air from across the room. Which mode spreads energy around the room?
A closed oven feels warm on your face from across the kitchen even before you touch the door or feel moving air. Which mode best explains the energy reaching your skin?
A ceramic mug filled with hot tea warms on the outside surface after a short time. Which mode moves energy through the solid mug wall?
A pump sends hot water through pipes from a boiler to wall radiators in a building. Which mode moves energy with the flowing water?
A heat lamp keeps fries warm from above, with an air gap between the lamp and the food. Which mode transfers energy from the lamp to the fries?
Cold air next to a window becomes denser and flows downward, while warmer room air moves in to replace it. Which mode is occurring near the window?
A pancake browns where it touches the hot griddle, while the griddle surface and pancake stay in direct contact. Which mode transfers energy into the pancake?
The figure traces energy leaving a computer processor. Which mode acts at Stage 1, where the chip touches the aluminum base?
The figure shows a room air path. Which mode is represented by the whole loop of air moving up, across, down, and back?
The figure follows energy in a solar water heater. Which mode acts at Stage 1, from sunlight to the black plate?
The figure traces heating in a saucepan. Which mode acts at Stage 2, as energy spreads through the metal base?
The figure shows barriers in a vacuum flask. Which mode is mainly reduced by Stage 3, the silver wall?
The figure shows a lava-lamp cycle. What mode transfers energy as the warmed liquid blobs rise and cooled blobs sink?
The figure traces energy near Earth's surface. Which mode acts at Stage 1, from the Sun to the ground?
The figure follows a car cooling system. Which mode acts at Stage 2, when the pump moves hot coolant through the radiator?
The figure traces energy in a metal spoon. Which mode acts at Stage 2, as energy spreads up the handle?
The figure traces energy from a fireplace to a chair across the room, with no contact between them. Which mode acts at Stage 1?
Which description matches conduction at the particle level?
Which description matches convection?
Which description matches thermal radiation?
Which mode requires direct physical contact between matter in the path of transfer?
Which mode requires a fluid that can flow, such as a liquid or a gas?
Which mode can transfer thermal energy through the vacuum of space?
Why are many metals good thermal conductors compared with wood or plastic?
When two touching objects reach the same temperature, what happens to net heat transfer between them?
A metal rail and a wooden bench are both at 10 °C. The rail feels colder to a hand. What is the best explanation?
A winter coat keeps a person warmer outside. Which physical account is correct?
A shiny windshield shade keeps a parked car cooler on a sunny day. Which explanation is best?
A vacuum flask has a nearly empty gap between its inner and outer walls. What does that gap reduce most directly?
Fiberglass insulation contains many tiny pockets of trapped air. Why does that help a wall slow energy transfer?
Two identical metal cans, one black and one white, sit under the same heat lamp. The black can warms faster. Which explanation fits?
A cook chooses a wooden handle for a metal pan. Why does the handle stay safer to touch than a metal handle would?
A cup of hot tea cools faster when its lid is removed. Which account best explains one reason?
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50 questions
