Energy Transfer www.assignmentpoint.com

turning energy from one form, into another. Energy Transfer turning energy from one form, into another.

The major reason for burning gasoline in an automobile engine is to convert chemical energy to mechanical energy. kinetic energy to potential energy. radiation to electrical energy. thermal energy to electrical energy.

A light bulb changes electrical energy into light energy only. heat and mechanical energy. light and heat energy. light and mechanical energy.

Something that allows thermal energy to pass easily Conductor Something that allows thermal energy to pass easily Metal Water Glass

Insulator Something that does NOT allow thermal energy to pass easily

Insulator Something that does NOT allow thermal energy to pass easily.

Conduction the transfer of thermal energy/electrons when objects contact each other. collisions of atoms

Which of the following best explains why the end of a spoon sticking out of a cup of hot water also gets hot? The hot water causes a chemical reaction to take place in the spoon. The heat from the hot water is conducted to the spoon handle. The hot water heats the air surrounding the upper part of the spoon. The hot water causes a physical change in the spoon handle

Heating, due to the upward current of hotter material. Convection Heating, due to the upward current of hotter material.

Atmospheric CONVECTION causes Hurricanes and Tornadoes.

Convection Which of the following is an example of heat transfer by convection? A hot wood stove heats an entire room. The handle of a pot that is being heated becomes warm. A teaspoon in a glass of hot tea becomes warm. The coils of a toaster become red.

When it is very hot in his room, Stuart makes it cooler by opening both the top and the bottom of his window. Which statement best explains why this works? Air comes in the top to cool the ceiling and in the bottom to cool the floor. Cooler air comes in the bottom and warm air goes out through the top. Warmer air goes out through both the bottom and top. It does not make any difference because if there is no wind, the air will not come in.

Radiation the transfer of energy by electromagnetic waves (photons), through space. When light rays hit a material, the molecules in that material move faster.

Radiation the transfer of energy by electromagnetic waves, through space.

When sand absorbs the electromagnetic waves of the Sun, it becomes warm through the process of conduction. convection. radiation. evaporation.

In which situation has heat energy moved mainly by conduction through matter? A radiator heated with hot water warms a room. The person sitting closest to the blazing fire finds it necessary to move farther from the heat. The handle of a cast iron skillet being used to cook something becomes too hot to touch. The red-hot coil of an electric space heater is used to keep a small room warm.

Which BEST explains how the food on the stove is being heated? conduction convection interaction radiation

Which of the following is an example of heat transfer by convection Which of the following is an example of heat transfer by convection? A hot wood stove heats an entire room. The handle of a pot that is being heated becomes warm. A teaspoon in a glass of hot tea becomes warm. The coils of a toaster become red.

When ice cream is left out of the freezer on a table for a long time, it melts. This change in state is caused by the ice cream giving up heat. air absorbing heat. ice cream absorbing heat. table absorbing heat.

What is the process by which heat energy gets to Earth from the Sun? conduction radiation subduction convection

Heat transferred from the wrench to the air. Patti used a steel wrench to work on her bicycle on a hot, sunny day. She left the wrench on the hot concrete for an hour, then returned, to find the wrench very hot to touch. What is the BEST explanation for how the wrench got so hot? Heat transferred from the wrench to the air. Heat transferred from the bicycle to the wrench. Heat transferred from the wrench to the concrete. Heat transferred from the concrete to the wrench.

How much energy it takes to increase the temperature of 1Kg by 1˚ C. Specific Heat For a given substance, How much energy it takes to increase the temperature of 1Kg by 1˚ C. 26 High for conductors Low for insulators 25 1.00 Kg

Through which of the following materials does heat travel the fastest Through which of the following materials does heat travel the fastest? glass metal plastic wood

Beaker X contains 100 milliliters of water and Beaker Y contains 250 milliliters of water. Each beaker is heated on a hot plate at the same medium heat setting for five minutes. Which is the best prediction of the water temperature in the beakers? Beaker X will have the highest temperature. Beaker Y will have the highest temperature. Beaker X and Beaker Y will have the same temperature. Beaker Y will have a temperature of 150°F.

Suppose you had four spoons the same size and shape made out of glass, plastic, steel, and wood. Which spoon handle would get hot the quickest when the spoons are placed in a pan of hot water? the glass spoon the plastic spoon the steel spoon the wooden spoon