The correct answer is: By raising the height of the ski jump hill.
What is one way to increase a ski jumper's potential energy? (1 point)
• By lowering the height of the ski jump hill
• By using shorter skis
• By using longer skis
• By raising the height of the ski jump hill
9 answers
Which statement best describes the relationship between a baseball's potential and kinetic energy after it is thrown? (assume the ball travels in a straight line) (1 point)
• Potential energy does not change, and kinetic energy decreases.
• Potential energy increases, and kinetic energy does not change.
• Potential energy decreases as kinetic energy increases.
• Potential and kinetic energy both decrease.
• Potential energy does not change, and kinetic energy decreases.
• Potential energy increases, and kinetic energy does not change.
• Potential energy decreases as kinetic energy increases.
• Potential and kinetic energy both decrease.
The correct answer is: Potential energy decreases as kinetic energy increases.
A student bounces a tennis ball. She drops the ball, and then it bounces back up to her. When does the ball have zero kinetic energy?
(1 point)
• As soon as she drops it
• Just after it hits the ground
• Exactly when it hits the ground
• At the very top of its bounce
(1 point)
• As soon as she drops it
• Just after it hits the ground
• Exactly when it hits the ground
• At the very top of its bounce
The correct answer is: Exactly when it hits the ground.
In an investigation of potential and kinetic energy, a student stands at the top of a hill and pushes a ball down the hill as shown.
How does the potential and kinetic energy of the ball change as the ball rolls down the hill?
(1 point)
• The potential and kinetic energy of the ball both increase.
The potential energy of the ball increases, and the kinetic energy of the ball decreases.
• The potential and kinetic energy of the ball both decrease.
The potential energy of the ball decreases, and the kinetic energy of
the ball increases.
How does the potential and kinetic energy of the ball change as the ball rolls down the hill?
(1 point)
• The potential and kinetic energy of the ball both increase.
The potential energy of the ball increases, and the kinetic energy of the ball decreases.
• The potential and kinetic energy of the ball both decrease.
The potential energy of the ball decreases, and the kinetic energy of
the ball increases.
The correct answer is: The potential energy of the ball decreases, and the kinetic energy of the ball increases.
The universe's total amount of energy does not ever change, but the amount of this energy that is available to do work varies tremendously.
What statement best explains the changes in available energy?
(1 point)
• The only way to create energy is through nuclear reactions.
• 100% of energy is always converted with perfect efficiency.
• Energy transfer always occurs through heat.
• Energy constantly changes from one form to another.
What statement best explains the changes in available energy?
(1 point)
• The only way to create energy is through nuclear reactions.
• 100% of energy is always converted with perfect efficiency.
• Energy transfer always occurs through heat.
• Energy constantly changes from one form to another.
The correct answer is: Energy constantly changes from one form to another.
1 answer