During energy transformation, all energy systems: are

a. 100 percent efficient

b. lose energy

c. gain heat energy

d. create energy

What type of subsurface material is able to store groundwater?

What two factors influence how strong the gravitational pull is between two objects?

Why do we only see one side of the moon

A hole of 1 mm² is punched in a full 1-liter milk carton, 5 cm from the bottom. What is the initial speed of the outflow?

The importance of parental influence on development of children

Describe the factors that form deep currents

A comet is cruising through the solar system at a speed of 50000 kilometers per hour for 4 hours time. What is the total distance traveled by the comet during this time in kilometers, miles, and light years?

A gas in a closed container is heated with 12J of energy, causing the lid of the container to rise 3m with 5N of force. What is the total change in energy?

What are illuminated objects?

During one year a population of blue jays has zero population growth. which must be true about the blue jay population at the end of the year compared to the beginning of the year?