Answer the following question given this paragraph: An electric generator is a device that changes kinetic energy to electrical energy through electromagnetic induction. A simple diagram of an electric generator is shown in Figure below . In a generator, some form of energy is applied to turn a shaft. This causes a coil of wire to rotate between opposite poles of a magnet. Because the coil is rotating in a magnetic field, electric current is generated in the wire. If the diagram in Figure below looks familiar to you, that's because a generator is an electric motor in reverse. Look back at the electric motor in Figure above . If you were to mechanically turn the shaft of the motor (instead of using electromagnetism to turn it), the motor would generate electricity just like an electric generator. You can learn how to make a very simple electric generator by watching the video at the URL below. Making your own generator will help you understand how a generator works. Q: What is a device that changes kinetic energy to electrical energy through electromagnetic induction? Choices: - a battery - a windmill - a diesel engine - an electric generator A:
an electric generator
Answer the following question given this paragraph: Sound Auditory stimuli are sound waves, which are mechanical, pressure waves that move through a medium, such as air or water. There are no sound waves in a vacuum since there are no air molecules to move in waves. The speed of sound waves differs, based on altitude, temperature, and medium, but at sea level and a temperature of 20 C (68 F), sound waves travel in the air at about 343 meters per second. As is true for all waves, there are four main characteristics of a sound wave: frequency, wavelength, period, and amplitude. Frequency is the number of waves per unit of time, and in sound is heard as pitch. High-frequency (15.000Hz) sounds are higher-pitched (short wavelength) than low-frequency (long wavelengths; 100Hz) sounds. Frequency is measured in. Q: Because sound waves must move through a medium, there are no sound waves in a what? Choices: - solid - liquid - gas - vacuum A:
vacuum
Q: Answer the following question given this paragraph: Atoms are indestructible and constantly in motion. Q: What are indestructible and constantly in motion? Choices: - viruses - crystals - ions - atoms A:
A: atoms
Question: Answer the following question given this paragraph: 2.2 Chemical Bonds Each moment of life, atoms of oxygen, carbon, hydrogen, and the other elements of the human body are making and breaking chemical bonds. Ions are charged atoms that form when an atom donates or accepts one or more negatively charged electrons. Cations (ions with a positive charge) are attracted to anions (ions with a negative charge). This attraction is called an ionic bond. In covalent bonds, the participating atoms do not lose or gain electrons, but rather share them. Molecules with nonpolar covalent bonds are electrically balanced, and have a linear three-dimensional shape. Molecules with polar covalent bonds have "poles"regions of weakly positive and negative chargeand have a triangular three-dimensional shape. An atom of oxygen and two atoms of hydrogen form water molecules by means of polar covalent bonds. Hydrogen bonds link hydrogen atoms already participating in polar covalent bonds to anions or electronegative regions of other polar molecules. Hydrogen bonds link water molecules, resulting in the properties of water that are important to living things. Q: Cations are attracted to anions, which are ions with what charge? Choices: - similar - neutral - positive - negative A:
Answer: negative
*Question*
Answer the following question given this paragraph: Carnivores consume animals. Examples include lions, polar bears, hawks, frogs, salmon, and spiders. Carnivores that are unable to digest plants and must eat only animals are called obligate carnivores. Other carnivores can digest plants but do not commonly eat them. Q: What do carnivores eat? Choices: - ice - plants - algae - animals A:
**Answer**
animals
*Question*
Answer the following question given this paragraph: Sedimentary rocks that are not horizontal have been deformed. Q: What is a defining feature of deformed sedimentary rocks? Choices: - not solid - only horizontal - not magnetic - not horizontal A:
**Answer**
not horizontal