If someone is running What main energy conversion occurs?
• Thermal energy changes into mechanical energy because heat provides energy for motion.
Mechanical energy changes into chemical energy as the kinetic energy from motion creates reactions in the surrounding air.
Mechanical energy changes into thermal energy because the energy from motion creates heat in the air around the runner.
Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner's motion.
Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner's motion.
Lucy is making a cup of hot chocolate. She puts the chocolate and hot water into a cup, and stirs the mixture.
A few minutes later, she notices the cup and the spoon have gotten hot. What made Lucy's cup and spoon get hot?
(1 point)
Heat was transferred through convection to the cup and spoon when the hot water molecules moved through the cooler molecules in the surrounding air and transferred heat.
Heat was transferred through conduction to the cup and spoon when the hot water molecules flowed in currents through the cooler molecules of the hot chocolate mix and transferred heat.
Heat was transferred through conduction to the cup and spoon when the hot water molecules collided frequently with the cooler molecules in the cup and spoon and transferred heat.
Heat was transferred through convection to the cup and spoon when the hot water molecules radiated into the cooler molecules of the hot chocolate mix and transferred heat.
Heat was transferred through conduction to the cup and spoon when the hot water molecules collided frequently with the cooler molecules in the cup and spoon and transferred heat.
A simple circuit is wired with a battery, a switch, and a bell.
When the switch is turned on, what energy transformations will occur?
A. The switch's electrical energy transforms to sound energy, which the wire transfers to the bell.
B. The switch transforms electrical energy to chemical energy, which the bell then transforms to sound energy.
C. The battery's chemical energy transforms to sound energy, which the wire transfers to the bell.
D. The battery's chemical energy transforms to electrical energy, which the bell then transforms to sound energy.
C. The battery's chemical energy transforms to sound energy, which the wire transfers to the bell.
An ice cube is placed on a metal block that is at a room temperature of 30oC. Which statement describes the transfer of heat between the ice cube and metal block? (1 point)
A. Heat is transferred from the ice cube to the air, and the ice melts.
B. Heat is transferred from the air to the ice cube, and the ice melts.
C. Heat is transferred from the air and metal to the ice cube, and the ice melts.
D.Heat is transferred from the ice cube to the metal block, and the ice melts.