Tag: general knowledge

If you release a ball inside a freely-falling elevator it stays in front of you instead of "falling to the floor" because you, the ball, and the elevator are all accelerating downward at the same acceleration, g. If you similarly release a helium-filled balloon, the balloon will--

Consider a boat loaded with scrap iron in a swimming pool. If the iron is thrown overboard into the pool, will the water level at the edge of the pool rise, fall, or remain unchanged?

An astronaut on earth notes that in her soft drink an ice cube floats with 9/10 its volume submerged. If she were instead in a lunar module parked on the moon, the ice in the same soft drink would float with

A thin stream of water bends toward a negatively charged rod. When a positively charged rod is placed near the stream, it will bend in the

A motorist wishes to travel 40 kilometers at an average speed of 40 km/hr. During the first 20 kilometers, an average speed of 40 km/hr is maintained. During the next 10 kilometers, however, the motorist goofs off and averages only 20 km/hr. To drive the last 10 kilometers and average 40 km/hr, the motorist must drive