General Science Part IV

15 Points Per Correct Answer - No time limit  

1. You're sitting in a small room (2 by 2 meter). It's very hot in the room. Then you have an idea and you rush off to get a big refrigerator. You put it in the room, switch it on with the door open, thinking you'll be able to lower the temperature of the room. Will the temperature go down in the room? Yes No

2. Suppose you're a spectator at a tennis game and you see someone get hit by a tennisball in the stomach. What would you prefer if you were that person, knowing that in the given options the speed of the ball will be the same? doesn't matter, only the speed and the effect on it are important get hit by a new tennisball get hit by an old tennisball doesn't matter, only the speed will determine the pain

3. You have two cylinders. The weight of both cylinders is identical. One is a massive wooden cylinder, the other one a tube made of iron. When you release them both at the same time on the top of a slope (1 meter at an angle of 45°), which one will be down first? the massive wooden cylinder both at the same time the iron tube both at the same time, but the iron tube will move first when released

4. Suppose you're on the moon and you want to put a rope around it. You put a stick in the ground, attach the rope and start walking. When you are almost back at the stick, you see your rope is exactly 1 meter too short to get completely around the moon. So you have a problem. You decide to put the rope in some kind of gutter. How deep does this gutter need to be in order to put the rope all of the way around the Moon? (mind you, you can put yard where I put meters, the answer will be the same) almost 0.0016 meters almost 0.00000016 meters almost 0.000016 meters almost 0.16 meters

5. Back to the refrigerator. Suppose you have also a deepfreezing compartment in it. When you open it twice in a short period, the second time it's more difficult to do so. What is the explanation for this effect? the door has a magnetic lock that works better when heated up Cold air escapes the first time and will freeze at the edge of the door, making it stick the second time The first time hot air will enter the freezer. When the door is closed, the air inside will compress and you get some kind of vacuum inside every door has a mechanical locking device with a build-in timer