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?

Question

options:

A). Heat is transferred from the air and metal to the ice cube, and the ice melts.

B). Heat is transferred from the ice cube to the metal block, and the ice melts.

C). Heat is transferred from the ice cube to the air, and the ice melts.

D). Heat is transferred from the air to the ice cube, and the ice melts.

Answer 1

The correct statement describing the transfer of heat between the ice cube and the metal block is:

A). Heat is transferred from the air and metal to the ice cube, and the ice melts.

This is because the ice cube, which is at a lower temperature, absorbs heat from both the air and the warmer metal block, causing the ice to melt.

Answer 2

Heated gases will rise to the top of its container. Why does this occur?

options:

Heated gases will increase 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 decrease in density.
Heated gases will decrease in kinetic energy and decrease in density.

Heated gases will increase in kinetic energy and increase in density.
Heated gases will increase in kinetic energy and increase in density.

Heated gases will decrease in kinetic energy and increase in density.

Answer 3

The correct option is:

Heated gases will increase in kinetic energy and decrease in density.

As gases are heated, their molecules gain kinetic energy, causing them to move faster and spread out, which leads to a decrease in density. The lower density of the heated gas compared to the cooler gas around it causes it to rise.

Answer 4

A woman runs as shown.What main energy conversion occurs?

options:

A). Mechanical energy changes into thermal energy because the energy from motion creates heat in the air around the runner.

B). Thermal energy changes into mechanical energy because heat provides energy for motion.

C). Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion.

D). Mechanical energy changes into chemical energy as the kinetic energy from motion creates reactions in the surrounding air.

Answer 5

The correct option is:

C). Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion.

When the woman runs, the chemical energy stored in the food she has consumed is converted into mechanical energy that enables her muscles to produce motion.