What is kinetic energy?(1 point)
Responses
thermal energy
thermal energy
the energy of motion
the energy of motion
the energy of radiation
the energy of radiation
stored energy
the energy of motion
A fisherman in a boat is drinking a cup of hot coffee. The large lake below his boat is full of cold water. Which statement is an accurate comparison of the lake water and the coffee?(1 point)
Responses
The lake will have more total thermal energy, and the particles in the lake water will be moving faster.
The lake will have more total thermal energy, and the particles in the lake water will be moving faster.
The coffee will have more total thermal energy, but the particles in the lake water will be moving faster.
The coffee will have more total thermal energy, but the particles in the lake water will be moving faster.
The lake will have more total thermal energy, but the particles in the coffee will be moving faster.
The lake will have more total thermal energy, but the particles in the coffee will be moving faster.
The coffee will have more total thermal energy, and the particles in the coffee will be moving faster.
The lake will have more total thermal energy, but the particles in the coffee will be moving faster.
The gallium in the image is melting in the person’s hand. Which changes will occur on a microscopic level?
(1 point)
Responses
The gallium atoms will gain potential energy, moving freely from each other.
The gallium atoms will gain potential energy, moving freely from each other.
The gallium atoms will gain kinetic energy.
The gallium atoms will gain kinetic energy.
The gallium atoms will increase in temperature.
The gallium atoms will increase in temperature.
The gallium atoms will be moving faster on average.
The gallium atoms will be moving faster on average.
Which object will have particles with the highest average kinetic energy?(1 point)
Responses
an iceberg at 0°C
an iceberg at 0°C
water at 40°C in a swimming pool
water at 40°C in a swimming pool
water at 37°C in a glass
water at 37°C in a glass
a drop of water at 90°C
a drop of water at 90°C
a drop of water at 90°C
Thermal energy is transferred to a substance. Which change can occur?(1 point)
Responses
The particles can gain potential and kinetic energy.
The particles can gain potential and kinetic energy.
The particles can gain kinetic energy, but the potential energy of the particles will stay the same.
The particles can gain kinetic energy, but the potential energy of the particles will stay the same.
The particles will gain potential energy, but the kinetic energy of the particles will stay the same.
The particles will gain potential energy, but the kinetic energy of the particles will stay the same.
The kinetic and potential energy of the particles will stay the same.
The particles can gain potential and kinetic energy.
Kinetic energy is the energy an object possesses due to its motion. To understand what kinetic energy is, we can break it down into its components. "Kinetic" refers to motion, and "energy" refers to the ability to do work or cause a change. Therefore, kinetic energy can be defined as the energy that an object has solely as a result of its motion.
To calculate the kinetic energy of an object, you need to know its mass and velocity. The formula for calculating kinetic energy is:
Kinetic Energy = (1/2) * mass * velocity^2
Where:
- Kinetic Energy is measured in joules (J)
- Mass is measured in kilograms (kg)
- Velocity is measured in meters per second (m/s)
By plugging in the values of mass and velocity into the formula, you can calculate the kinetic energy of an object. It's important to note that as velocity increases, the kinetic energy of an object increases exponentially.
So, to summarize, kinetic energy is the energy of motion and can be calculated using the formula: (1/2) * mass * velocity^2.