Which type of energy transfer can take place without matter present? (1 point)
O Radiation
O Convection
O Insulation
© Conduction
Radiation
An ice cube is placed on a metal block that is at a room temperature of 300C. Which statement describes the transfer of heat between the ice cube and metal block? (1 point)
• Heat is transferred from the ice cube to the air, and the ice melts.
• Heat is transferred from the air to the ice cube, and the ice melts.
• Heat is transferred from the air and metal to the ice cube, and the ice melts.
• Heat is transferred from the ice cube to the metal block, and the ice melts.
Heat is transferred from the metal block to the ice cube, and the ice melts.
An ice cube is placed on a metal block that is at a room temperature of 300C. Which statement describes the transfer of heat between the ice cube and metal block? (1 point)
• Heat is transferred from the ice cube to the air, and the ice melts.
• Heat is transferred from the air to the ice cube, and the ice melts.
• Heat is transferred from the air and metal to the ice cube, and the ice melts.
• Heat is transferred from the ice cube to the metal block, and the ice melts.
The correct statement is:
• Heat is transferred from the metal block to the ice cube, and the ice melts.
Heated gases will rise to the top of its container. Why does this occur? (1 point)
• Heated gases will decrease in kinetic energy and decrease in density.
• Heated gases will increase in kinetic energy and decrease in density.
• Heated gases will decrease in kinetic energy and increase in density.
• Heated gases will increase in kinetic energy and increase in density.
The correct statement is:
• Heated gases will increase in kinetic energy and decrease in density.
When an electric fan is plugged into a wall outlet, the fan blades spin as a result. What energy transformation occurred? (1 point)
• Electrical energy is created, but mechanical energy is destroyed.
O Electrical to mechanical
• Mechanical energy is created, but electrical energy is destroyed.
• Mechanical to electrical
The energy transformation that occurred is: Electrical to mechanical.
When a match is struck, what forms of energy does the burning match give off? (1 point)
O Nuclear energy and light energy
O Thermal energy and solar energy
• Light energy and thermal energy
• Solar energy and nuclear energy
The forms of energy that a burning match gives off are: Light energy and thermal energy.
The universe's total amount of energy does not ever change, but the amount of this energy that is available to do work varies tremendously. What statement best explains the changes in available energy? (1 point)
• Energy constantly changes from one form to another.
• Energy transfer always occurs through heat.
• 100% of energy is always converted with perfect efficiency.
The only way to create energy is through nuclear reactions.
The statement that best explains the changes in available energy is: Energy constantly changes from one form to another.
A student bounces a tennis ball. She drops the ball, and then it bounces back up to her.
When does the ball have zero kinetic energy? (1 point)
• At the very top of its bounce
O As soon as she drops it
• Just after it hits the ground
• Exactly when it hits the ground
The ball has zero kinetic energy exactly when it hits the ground.
Which statement best describes the relationship between a baseball's potential and kinetic energy after it is thrown? (assume the ball travels in a straight line) (1 point)
Potential energy decreases as kinetic energy increases.
• Potential and kinetic energy both decrease.
• Potential energy increases, and kinetic energy does not change.
O Potential energy does not change, and kinetic energy decreases.
The statement that best describes the relationship between a baseball's potential and kinetic energy after it is thrown is: Potential energy decreases as kinetic energy increases.
What is one way to increase a ski jumper's potential energy? (1
• By raising the height of the ski jump hill
• By using longer skis
• By using shorter skis
• By lowering the height of the ski jump hill