QUES: The old vaulted church was stripped down: there was no cloth on the altar, just a DJ's toolkit and his beer. Through the dark, I could see three bolts left in the wall from where they'd taken down the crucifix. A confessional too beaten-up to have been sold was shaking in a way that suggested activity inside, and where the pews had been taken out, a couple hundred people were testifying to the DJ's moving sermon. Rachel stepped forward into the crowd while I took a moment to drink in the ceiling's blue-lit, shadowed vault and the light-catching haze from who-knows-what rising between the DJ and the crowd. There was a terrific echo, each beat reverberating inside of the next, and the old stained-glass windows rattled in their frames. On the dance floor, people moved with their eyes closed and their hands in the air. I danced with Rachel for a while, but then something by the bar seemed to be pulling her eyes. She told me that she was heading for a drink and slipped out of the crowd. When she hadn't come back halfway through the next song, I glanced over at the bar. It was just a little set-up where someone had stacked a few crates and brought something alcoholic to share, mostly beer. Rachel was standing with a plastic cup, looking like she was having a conversation, but I couldn't see anyone else there. The next time the crowd split, I saw him. He stood in front of a blue light, so I couldn't see him clearly, but what I saw was memorable. He wore a jacket of what might have been blue velvet, and his hair gleamed black against his white skin. The blue haze seemed to stop just shy of his pallor, setting off his striking face without illuminating its details, and his wrists flashed white in the darkness. He didn't move, just stared and held his drink. The next time I saw them, his mouth was moving. She nodded and he took her arm. I watched them through the crush of dancers as they squeezed along the wall, and the feeling came to me that something was very wrong. Saturday morning, I woke up and saw that she still hadn't come home.
Do you have any questions?
MY QUESTION: Where was the crucifix

QUES: The Venetian artist Jacopo de' Barbari, whom Durer had met in Venice, visited Nuremberg in 1500, and Durer said that he learned much about the new developments in perspective, anatomy, and proportion from him. De' Barbari was unwilling to explain everything he knew, so Durer began his own studies, which would become a lifelong preoccupation. A series of extant drawings show Durer's experiments in human proportion, leading to the famous engraving of Adam and Eve (1504), which shows his subtlety while using the burin in the texturing of flesh surfaces. This is the only existing engraving signed with his full name. Durer made large numbers of preparatory drawings, especially for his paintings and engravings, and many survive, most famously the Betende Hande (English: Praying Hands, c. 1508 Albertina, Vienna), a study for an apostle in the Heller altarpiece. He also continued to make images in watercolour and bodycolour (usually combined), including a number of still lifes of meadow sections or animals, including his Young Hare (1502) and the Great Piece of Turf (1503, both also Albertina).
Do you have any questions?
MY QUESTION: When did Durer make his most famous preparatory drawing?

QUES: Take a look at this train in Figure 1.11. It looks very futuristic. What do you notice about it? Did you notice that the train has no wheels? How can a train have no wheels? It doesn't need wheels. It actually floats, or levitates, just above the track. Magnets enable the train to do this. This is not a normal train. This is a maglev train. The word maglev stands for magnetic levitation. Because it has no wheels, there is no friction. Some magnets hold the train up. Other magnets are used to move the train forward. This train can go very fast. It can reach speeds up to 480 kilometers (300 miles) per hour! Magnets are pretty cool. What exactly is a magnet? How is it able to exert such force?
Do you have any questions?
MY QUESTION: What do you notice about figure 1.11?

QUES: Mechanical energy is a combination of the energy of motion or position. This type of energy describes objects that are moving or could move. A moving ball can have energy from motion. An arrow can also have the energy of motion. Both are types of mechanical energy. Can you think of some other examples? Where does the energy of motion come from? It comes from the energy created by position. This energy is stored energy. This means it is not moving yet, but it has the potential to move. How can you store energy? The arrow gains energy from the drawn bow. As the arrow is released, the bow releases its stored energy and puts the arrow into motion. Can you think of some other ways to store energy using position?
Do you have any questions?
MY QUESTION:
What kind of energy is created by position?