Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
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Question: Context: Energy, or the ability to do work, can exist in many different forms. The photo in Figure 17.8 represents six of the eight different forms of energy that are described in this lesson. The guitarist gets the energy he needs to perform from chemical energy in food. He uses mechanical energy to pluck the strings of the guitar. The stage lights use electrical energy and give off both light energy and thermal energy, commonly called heat. The guitar also uses electrical energy, and it produces sound energy when the guitarist plucks the strings. For an introduction to all these forms of energy, go to this URL: . For an interactive animation about the different forms of energy, visit this URL: After you read below about different forms of energy, you can check your knowledge by doing the drag and drop quiz at this URL: . Mechanical energy is the energy of an object that is moving or has the potential to move. It is the sum of an objects kinetic and potential energy. In Figure 17.9, the basketball has mechanical energy because it is moving. The arrow in the same figure has mechanical energy because it has the potential to move due to the elasticity of the bow. What are some other examples of mechanical energy? Energy is stored in the bonds between atoms that make up compounds. This energy is called chemical energy, and it is a form of potential energy. If the bonds between atoms are broken, the energy is released and can do work. The wood in the fireplace in Figure 17.10 has chemical energy. The energy is released as thermal energy when the wood burns. People and many other living things meet their energy needs with chemical energy stored in food. When food molecules are broken down, the energy is released and may be used to do work. Electrons are negatively charged particles in atoms. Moving electrons have a form of kinetic energy called electrical energy. If youve ever experienced an electric outage, then you know how hard it is to get by without electrical energy. Most of the electrical energy we use is produced by power plants and arrives in our homes through wires. Two other sources of electrical energy are pictured in Figure 17.11. The nuclei of atoms are held together by powerful forces. This gives them a tremendous amount of stored energy, called nuclear energy. The energy can be released and used to do work. This happens in nuclear power plants when nuclei fission, or split apart. It also happens in the sun and other stars when nuclei fuse, or join together. Some of the suns energy travels to Earth, where it warms the planet and provides the energy for photosynthesis (see Figure The atoms that make up matter are in constant motion, so they have kinetic energy. All that motion gives matter thermal energy. Thermal energy is defined as the total kinetic energy of all the atoms that make up an object. It depends on how fast the atoms are moving and how many atoms the object has. Therefore, an object with more mass has greater thermal energy than an object with less mass, even if their individual atoms are moving at the same speed. You can see an example of this in Figure 17.13. Energy that the sun and other stars release into space is called electromagnetic energy. This form of energy travels through space as electrical and magnetic waves. Electromagnetic energy is commonly called light. It includes visible light, as well as radio waves, microwaves, and X rays (Figure 17.14). The drummer in Figure 17.15 is hitting the drumheads with drumsticks. This causes the drumheads to vibrate. The vibrations pass to surrounding air particles and then from one air particle to another in a wave of energy called sound energy. We hear sound when the sound waves reach our ears. Sound energy can travel through air, water, and other substances, but not through empty space. Thats because the energy needs particles of matter to pass it on. Energy often changes from one form to another. For example, the mechanical energy of a moving drumstick changes to sound energy when it strikes the drumhead and causes it to vibrate. Any 
 Question: energy of an object that is moving or has the potential to move

Answer: mechanical energy


Question: Context: Nowadays they are giving homework even during the holidays and I hate that very much. But I think there is a reason for it. Homework is given so that we can remember whatever we have learnt. Regular drilling and repetition make perfect. But teachers have started to give too much homework. Anything in excess is bad. Jane What's the use of just homework without allowing children to get an insight into the subject? It just makes them bookworms but nothing else. Homework such as writing some things 5 times at home will just make them memorize things but not put them into use. I regret to say that teachers find it easy to bundle the children with homework rather than making them get interested to understand what they learn. The same trend continues even in college. I find that most of the so-called high scorers are unable to answer simple things in an interview. Sally It is OK to give homework. But it should be given less. We are spending most of our time in school and at least we must be free in our home. If you give homework, we will be very tired and we wouldn't be able to pay attention to extra-curricular activities, which in turn may affect our physical and mental health. So please give less homework to us. Johnson It is part of our work to give students homework. There will be some punishments if we won't do our work. So I have to do that though I know such a teacher is not liked by students. 
 Question: Who thinks that too much homework may do harm to students' physical and mental health?

Answer: sally.


Question: Context: At the Kibbutz Stein in Israel in 1956, school teacher Rachel (Clarice van Houten) is reunited with Ronnie (Halina Reijn), a friend from The Hague during World War II. After Ronnie leaves, Rachel reflects on her adventures during the final days of the war.In 1944, Rachel hides from the Nazis in a farm in the Dutch countryside. In exchange for hiding her, they expect her to learn Bible verses. One day, a crippled Allied bomber drops its payload on the farmhouse, killing everyone except Rachel. Rob (Michiel Heisman), a young man from a neighboring farm, hides her in the family's greenhouse. That night, Van Gein (Peter Blok), a police officer, arrives to tell them that the Nazis know that Rachel is in the area and will hunt her down. He agrees to help Rachel and Rob escape to the Allied controlled southern part of Holland. Rachel visits her father's lawyer, Smaal (Dolf de Vries). He gives her enough money and jewels to live on for a year but warns her not to trust people so easily. Van Gein leads Rachel and Rob to a dock where other Jews wait to leave. Rachel is reunited with her parents and brother, who is recovering from an emergency appendectomy. Van Gein does not accompany the Jews on the boat trip. That evening, the boat is ambushed by a Nazi patrol boat. The Nazis immediately open fire; only Rachel survives the massacre. Before drifting down the river, she sees the Nazis loot the corpses.Rachel is found by Resistance fighters who smuggle her into The Hague by disguising her as a typhoid victim and placing her in a coffin that if properly "sealed" has sizable air holes. She is taken to a soup kitchen run by another member of the Resistance, Gerben Kuipers (Derek de Lint) and given the new name of Ellis de Vries. Eventually she is made a part of the Resistance's plans to smuggle in British guns and rations. The smugglers are led by Hans Akkermans (Thom Hoffman), an expert marksman. He and Ellis are to pose as husband and wife so the Nazis will not search their luggage on the train; the luggage is actually full of weaponry. But when the Nazi soldiers on the train clearly do intend to search all baggage, a new plan is needed. Ellis takes the bags and enters a private compartment occupied by SD Colonel Muntze (Sebastian Koch). The Nazis don't search Muntze's compartment. Ellis and Muntze are clearly attracted to each other and she accepts an offer to visit him at his office. Hans is clearly jealous.A truck carrying the British guns crashes in front of the soup kitchen. Kuiper's son, Tim (Ronald Armbrust) was driving and is arrested by the Gestapo. While the others go into hiding, Ellis arranges a meeting with Muntze hoping that she can persuade him to release Tim. Knowing he is an avid stamp collector, she takes some rare Dutch stamps to him. He invites her to a Nazi party. There she sees SS commandant Gunter Franken (Waldemar Kobus) and recognizes him as the Nazi who led the ambush against the refugee boat. Although she is sickened at his sight, she manages to sing at the party later. She and Muntze return to his suite to make love. He intuits that she is Jewish from her dyed blond hair but has fallen in love with her. She accepts a job in his office and begins work the following day. There she meets Ronnie, who is Franken's secretary/sex partner. Franken gives them a report indicating that Tim has confessed everything and is to be executed, however, Muntze refuses to sign the execution order.Ellis sees Smaal at Nazi headquarters and learns that he and Muntze have negotiated a cease fire -- if the Resistance ceases its attacks against the Nazis, the Nazis will cease its violent reprisals against Dutch civilians. However, when a hidden microphone placed by Ellis in Franken's office reveals that Franken and Van Gein have been working together to kill and rob Jews trying to escape into Allied territory, a controversy amongst the Resistance fighters ensues. Van Gein is heard 
 Question: What device does Ellis plant in Franken's office?

Answer:
a hidden microphone