Where does your body get the energy it uses to make your heart beat?
A) It comes from the radiative energy of the sunlight that hits your skin.
B) It comes from the chemical potential energy of the food you eat.
C) It comes from the thermal energy of the water you drink.
D) It comes from the kinetic energy of the molecules in the air that you breathe in.
E) It is created by your brain during the time that you rest or sleep.
B) It comes from the chemical potential energy of the food you eat.
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Which of the following is not an expected consequence of global warming?
A) an increase in the severity of winter blizzards B) an increase in the number and intensity of hurricanes C) melting of polar ice and glaciers D) the entire Earth warming up by the same amount
In the burning of wood (a common chemical reaction) mass is conserved.
A. true B. false
The ultimate fate of the Universe depends on the nature of dark energy
Indicate whether the statement is true or false
Stars in the same constellation
a. probably formed at the same time. b. must be part of the same cluster of stars in space. c. must have been discovered at about the same time at the same location in space. d. may actually be very different distances away from the observer and from each other.