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_________ are high energy rays used in medicine to sterilize equipment and are often used in surgery
What energy transformation below occurs in a blow dryer?
Electrical -> thermal
chemical -> thermal
Electrical -> chemical
thermal -> electrical
Which is an example of kinetic energy?
A soccer ball is lying on the ground.
A person is standing in line.
A roller coaster is sitting at the top of a hill.
Water is flowing over a dam.
Conservation of energy means that
energy can be created but not destroyed
energy can be destroyed but not created
energy can be both created and destroyed
energy can be neither created nor destroyed
Which is the best example of an object with only potential energy?
a boat sailing through the water
a boulder resting on top of a cliff
a ball being thrown across a field
water being poured out of a pitcher
If a green golf ball is dropped from a height of 7 feet and a yellow golf ball is dropped from a height of 12 feet, which ball has greater potential energy before it is released?
Both have the same amount of potential energy
Neither will have more potential energy than the other
When a roller coaster reaches the bottom of a steep slope, it has...
low PE and high KE
high PE and low KE
low PE and low KE
high PE and high KE
Where would this tossed baseball have the least amount of kinetic energy?
The measure of the average kinetic energy of each atom in the substance is known as the __________
The amount of energy needed to heat up one kg of a substance by 1°C or 1K is known as the....
Specific Heat Capacity
Which of the following is not a way of transferring heat?
Energy can not move in this type of system
Machine’s can never be fully efficient because some of their energy will be lost as...?
Materials that can easily transfer heat are called
A wooden bench and a metal bench on a hot summer day will be different temperature because they have different...?
Isotopes are two atoms that have....?
The same number of neutrons
The same number of electrons
Different number of electrons
Different number of neutrons
Gamma radiation emits ....?
The time taken for an isotopes to fall to half its original value is known as the
The sun is an example of
____________ has the greatest impact on earth’s energy.
Which of the following is not a greenhouse gas?
Which of the following is not a source of human-produced greenhouse emissions