The __________ is the SI unit of energy.
By what process does the Sun produce enough energy to warm Earth?
|D)||transformation of thermal energy into kinetic energy|
What two factors determine how much gravitational potential energy is in an object?
|A)||weight and speed of the object|
|B)||weight of the object and height above the ground|
|C)||shape and speed of the object|
|D)||shape of the object and its position relative to the ground|
Which of the following vehicles has the most kinetic energy?
|A)||a 900-kg car traveling 80 km/h|
|B)||a 1,100-kg car traveling 60 km/h|
|C)||a 2000-kg truck traveling 50 km/h|
|D)||a 300-kg motorcycle traveling 100 km/h|
A baseball is hit into the air with a bat. When does the baseball have the greatest gravitational potential energy?
|A)||when it leaves the bat|
|B)||when it reaches its highest point|
|C)||when it hits the ground|
|D)||when the mechanical and kinetic energies of the baseball are equal|
What two factors determine how much potential energy an object has?
|A)||mass and position|
|B)||speed and mass|
|C)||speed and surface area|
|D)||speed and position|
The law of conservation of energy states that __________.
|A)||energy is not created or destroyed and its form is constant|
|B)||energy cannot be created or destroyed|
|C)||when energy is transformed, the total energy of a system is less than it was before the change|
|D)||energy can be created and destroyed but cannot change form|
As energy transformations occur within a system, the total energy of the system __________.
|B)||is transferred out of the system|
During energy transformations, energy is never __________.
|A)||used to increase an object's potential energy|
|B)||created or destroyed|
|C)||released as heat|
Which of the following statements about an apple falling from a tree is true?
|A)||Its kinetic and potential energies remain constant.|
|B)||Its kinetic energy decreases and its potential energy increases.|
|C)||Its potential energy decreases and its kinetic energy increases.|
|D)||Its mechanical energy increases.|
__________ is the energy stored in an object due to its position.
What is a joule?
|A)||the unit of measurement describing the change in velocity in a unit time|
|B)||a unit of energy that depends on both an object's mass and velocity|
|C)||a unit measuring the amount of energy we get from various foods|
|D)||the unit of force required to move 1 kg of mass 1 m/s/s|
How much gravitational potential energy does a 75-kg diver have stepping off the edge of a 5-m platform?
__________ is energy stored by things that stretch or compress.
|A)||Elastic kinetic energy|
|B)||Chemical kinetic energy|
|D)||Elastic potential energy|
Which of the following objects has potential energy?
|A)||a ball rolling across the floor|
|B)||a bowling ball knocking over a pin|
|C)||a glass sitting on a table|
|D)||a bicycle coasting down a hill|
Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.
How much kinetic energy does a moving object have if its mass is 100 kg and it is moving at a speed of 5 meters per second?
Carbohydrates and proteins each supply about __________ Calories of energy per gram.
What two factors determine how much kinetic energy an object has?
|A)||position and mass|
|B)||speed and surface area|
|C)||speed and mass|
|D)||speed and position|
One food Calorie is equivalent to approximately __________.