A city gets its electricity from a dam, where water is stored in a reservoir. How does the water provide the city with its power?(1 point) Responses Mechanical energy in the water is transferred to turbines that spin a generator, which changes the mechanical energy into electricity. Mechanical energy in the water is transferred to turbines that spin a generator, which changes the mechanical energy into electricity. Potential energy in the water becomes kinetic energy as it moves through turbines, which turn kinetic energy into mechanical energy that spins a generator, which changes mechanical energy into electricity. Potential energy in the water becomes kinetic energy as it moves through turbines, which turn kinetic energy into mechanical energy that spins a generator, which changes mechanical energy into electricity. Kinetic energy in the water becomes potential energy as the water moves through turbines, where kinetic energy becomes mechanical energy that spins a generator. Kinetic energy in the water becomes potential energy as the water moves through turbines, where kinetic energy becomes mechanical energy that spins a generator. Chemical energy in the water becomes thermal energy as it moves through turbines, which change thermal energy into electricity.

Question

A city gets its electricity from a dam, where water is stored in a reservoir. How does the water provide the city with its power?(1 point) Responses Mechanical energy in the water is transferred to turbines that spin a generator, which changes the mechanical energy into electricity. Mechanical energy in the water is transferred to turbines that spin a generator, which changes the mechanical energy into electricity. Potential energy in the water becomes kinetic energy as it moves through turbines, which turn kinetic energy into mechanical energy that spins a generator, which changes mechanical energy into electricity. Potential energy in the water becomes kinetic energy as it moves through turbines, which turn kinetic energy into mechanical energy that spins a generator, which changes mechanical energy into electricity. Kinetic energy in the water becomes potential energy as the water moves through turbines, where kinetic energy becomes mechanical energy that spins a generator. Kinetic energy in the water becomes potential energy as the water moves through turbines, where kinetic energy becomes mechanical energy that spins a generator. Chemical energy in the water becomes thermal energy as it moves through turbines, which change thermal energy into electricity.

Answer 1

Potential energy in the water becomes kinetic energy as it moves through turbines, which turn kinetic energy into mechanical energy that spins a generator, which changes mechanical energy into electricity.

Answer 2

An airplane carries 320 passengers from Phoenix to Los Angeles flying at an average speed of 490 miles per hour. On the return flight, the plane carries 164 passengers and travels at the same average speed. What happens to the plane’s kinetic energy?(1 point) Responses On the return flight, the plane has more kinetic energy. On the return flight, the plane has more kinetic energy. On the return flight, the plane has less kinetic energy. On the return flight, the plane has less kinetic energy. The plane’s kinetic energy is changed to potential energy when it lands. The plane’s kinetic energy is changed to potential energy when it lands. The plane’s kinetic energy is the same on both flights.

Answer 3

The plane’s kinetic energy is the same on both flights.

Answer 4

A racehorse is running at 42 miles per hour, equivalent to 18.8 meters per second. The horse and its jockey have a combined mass of 512 kilograms. How much kinetic energy do they have? KE=12mv2 (1 point) Responses 90,480.6 J 90,480.6 J 451,584.0 J 451,584.0 J 180.961.3 J 180.961.3 J 4,812.8 J

Answer 5

To calculate the kinetic energy (KE), we need to use the formula KE = 1/2 * m * v^2, where m is the mass of the horse and jockey (512 kg) and v is the velocity (18.8 m/s).

Plugging in the values, we have:
KE = 1/2 * 512 kg * (18.8 m/s)^2
KE = 1/2 * 512 kg * (353.44 m^2/s^2)
KE ≈ 90,480.6 J

Therefore, the kinetic energy of the horse and jockey is approximately 90,480.6 J.

Answer 6

Mr. Starr pushed a cart full of groceries to his car. After emptying the cart, he pushed it back to the store. He pushed the cart at a speed of 2 meters per second each way. Which is the best prediction?(1 point) Responses The cart’s kinetic energy depends on Mr. Starr’s mass. The cart’s kinetic energy depends on Mr. Starr’s mass. The cart had the same kinetic energy going each way. The cart had the same kinetic energy going each way. When it was empty, the cart had less kinetic energy. When it was empty, the cart had less kinetic energy. When it was full, the cart had less kinetic energy.

Answer 7

The cart had the same kinetic energy going each way.

Answer 8

What is the best description of one billiard ball hitting a second billiard ball?(1 point) Responses Potential energy is transferred from the first ball to the second ball. Potential energy is transferred from the first ball to the second ball. Most of the kinetic energy in the first ball is transferred to the second ball. Most of the kinetic energy in the first ball is transferred to the second ball. Kinetic energy in the second ball is transferred to the first ball. Kinetic energy in the second ball is transferred to the first ball. All of the kinetic energy in the first ball is transferred to the second ball.

Answer 9

Most of the kinetic energy in the first ball is transferred to the second ball.

Answer 10

A spreadsheet application is used to create a computational model of the energy experienced by a pendulum. How do the energy values of the pendulum relate?(1 point) Responses The sum of the potential energy and the kinetic energy is always 0. The sum of the potential energy and the kinetic energy is always 0. The potential energy is always greater than the kinetic energy. The potential energy is always greater than the kinetic energy. The kinetic energy is always equal to the potential energy. The kinetic energy is always equal to the potential energy. The sum of the potential energy and the kinetic energy is always constant. The sum of the potential energy and the kinetic energy is always constant.