When does Newton's cradle have the most potential energy?
halfway in its downward swing
when it is initially pulled back
at rest
halfway in its upward swing
True or False: Energy conversions are always 100% efficient.
False
Why do incandescent (old fashion) light bulbs require more energy than LED (modern) light bulbs?
they are larger than LED
more energy is converted to radiant instead of thermal
they use a 3-prong plug
more energy is converted to thermal instead of radiant
Why don't bouncy balls return to their starting height when dropped without an applied force?
gravity becomes stronger near the ground
it should, but doesn't because gravity is acting on the ball
the inertia is greater than the starting potential energy
friction converts kinetic energy into thermal energy
What kind of resources are coal, water, and wood?
non-renewable resources
renewable resources
natural resources
man-made resources
True or False: A downfall to nonrenewable resources is that they can take as long as 10 years to replenish.
False
True or False: Fossil fuels are made from the fossils of dinosaurs and prehistoric plants.
False
Which of the following are needed to create fossil fuels?
heat, pressure, millions of years
heat, volume, millions of years
heat, pressure, hundreds of years
cold, pressure, thousands of years
How could electromagnetic induction be produced? (2 options)
with electricity being applied to a magnet
none of the above
by rotating either the metal wire or magnetic field together
with a changing magnetic field surrounded by plastic wires
What is the difference in electricity generation between solar panels and power plants like wind, coal, and nuclear?
Solar panels don't use electromagnetic induction.
Solar panels produce more harmful radiation than the others.
Coal, wind, and nuclear are cleaner than solar.
Solar is non-renewable, while coal, wind, and nuclear are.
Why do most power plants use turbines to generate electricity?
to create excessive amounts of static electricity
to put heliostats in position to generate more electricity
to make the mechanical motion for electromagnetic induction
to stoke the coal fire needed to generate electricity
Why is it important for battery technology to improve within the alternative energy field?
to store energy for when energy availability is lacking
to clean the electricity from coal power plants
to make electricity needed for windmills and solar to work
they'll explode if overused
According to the law of conservation of energy, what is the 1st energy conversion that takes place when fossil fuels are used to generate electricity?
stored chemical energy transforms into thermal energy
mechanical energy transforms into electrical energy
thermal energy transforms into mechanical energy
look directly into the sun
According to the law of conservation of energy, what is the 2nd energy conversion that takes place when fossil fuels are used to generate electricity?
mechanical energy transforms into electrical energy
stored chemical energy transforms into thermal energy
thermal energy transforms into mechanical energy
touching fire with your bare hands
According to the law of conservation of energy, what is the 3rd energy conversion that takes place when fossil fuels are used to generate electricity?
getting struck by lightning
stored chemical energy transforms into thermal energy
thermal energy transforms into mechanical energy
mechanical energy transforms into electrical energy
How do solar thermal power plants generate electricity?
PV cells absorb thermal energy and convert it to electrical
heliostats direct light energy to turn water into steam
heliostats direct thermal energy to turn water into steam
PV cells absorb light energy and convert it to electrical
