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KE PE Thermo- Dynamics C,C,R C,C,R continued 10 Point 10 Point 10 Point 10 Point 10 Point 20 Points 20 Points 20 Points 20 Points 20 Points 30 Points 30 Points 30 Points 30 Points 30 Points 40 Points 40 Points 40 Points 40 Points 40 Points 50 Points 50 Points 50 Points 50 Points 50 Points
At which location does the skateboarder have the most kinetic energy and the least potential energy?
A 4-kilogram object is moving at a speed of 3 m/s. What is the KE of the object in Joules?
A ball of clay is dropped onto the floor and does not rebound. Which of the following best explains what happened to the kinetic energy of the ball of clay just after it hits the floor? A. All of the energy is inside the clay after the collision. B. The energy is shared between the floor and the clay. C. All of the energy is inside the floor after the collision. D. The energy no longer exists after the collision with the floor.
If a juggler is juggling oranges, at it’s highest point, what type of energy does it have?
A compressed basketball and a stretched rubber band are examples of what type of PE?
Why is the gravitational potential energy of an object 1 meter above the moon’s surface less than its potential energy 1 meter above Earth’s surface? • The object’s mass is less on the moon. • The object’s weight is more on the moon. • The object’s acceleration due to gravity is less on the moon. • both A and C
The figure below shows a wagon that moves from point X to point Y. Which of the following best describes the wagon’s change in energy as it coasts from point X to point Y? The wagon has the same kinetic energy at point Y and at point X. The wagon has more gravitational potential energy at point Y than at point X. The wagon has more kinetic energy at point Y than at point X. The wagon has the same gravitational potential energy at point Y and point X.
The wagon has more gravitational potential energy at point Y than at point X.
According to the first law of thermodynamics, the amount of work done by a heat engine equals the amount of • work done on the engine. • waste heat it produces. • thermal energy added to the engine minus the waste heat. • thermal energy added to the engine plus the waste heat.
The second law of thermodynamics states that thermal energy can flow from colder objects to hotter objects only if?
Hot vegetable soup is placed in a refrigerator. What happens can be best described by which of the following? A. The refrigerator destroys the heat inside the soup until there is more coldness than energy. B. The refrigerator destroys all the heat inside the soup until there is only coldness. C. The soup releases energy to the refrigerator and the contents of the refrigerator. D. The soup absorbs coldness from the refrigerator and the contents of the refrigerator.
The soup releases energy to the refrigerator and the contents of the refrigerator.
Which of the following would NOT make a good heat conductor? • Copper wire • Coils of an electric heater • Plastic foam cup • Aluminum soda can
In a charcoal grill, most of the heat from glowing coals reaches the food on the grill through which process of heat transfer?
When a liquid or gas is heated, its particles gain energy and move faster and farther apart, so its density decreases. When a liquid or gas is cooled, its particles lose energy, move more slowly, and stay closer together, so its density increases. Which of the following statements is NOT true? • Hot water is denser than cold water • Cold air is denser than warm air • Convection currents are caused by differences in density • Warm air is less dense than cold air
In winter, the air just above the top bunk of a bunk bed is warmer than the air just above the bottom bunk because warm air rises. Which of the following describes the method of heating that causes this difference in temperature?