1.As a rocket rises its acceleration increases. Why does thishappen? (assume that the acceleration due to gravity and airresistance are nearly constant during the ascent)
2. If the head of the hammer is loose, and you wish tighten it bybaging it against the top of a work benchm why si it bettwee tohold it with the handle down ( as indicated in the diagram to theright) than to hold with the head down?
3. If a four-engine jet accelerate down a runway at 2.0m/s^2 andone of its engines suddenly fails, how much acceleration will theramaining three produce? ( asuume that all four engines areidentical.)
4. If an elephant was chasing you, its enourmous mass would be mostthreatning, but if made a quick turn, its mass would be to youradvantage. Why?
5. Many automobile passengers waiting at traffic lights havesuffered nech injuries when their cars were struck from behind.Explain why this happens, how can head rests reduce the severity ofthis type of injury?
6. Some people used to think that a spaceship could not maneuverover it left the earths's atmosphere because it would have no airto push against, obiviously, this thinking must be wrong sincerocket engines have been used to steer vehicles through space sincethe late 1950s. how does a rocket engine manage to apply a force toa spaceship in the vacuum of outer space?
7. If a bicycle and a truck have a head-on collision, which vehicleexperiences the greater force? which undergoes the greateraccleration?
8.two closed containers look the same, but one is tightly packedwith lead and the other loosely packed with feathers. how could youdetermine which was which if you and the containers were weightlessin outer space?
9. Two teams are involved in a tug-of-war. why is it wrong to saythat the team that pulls the hardest wins? what force realllydetermines who wins?
10. The photo on the website shows a physics teacher sandwichebetween two bed of nails. A second physics teacher is pulverizing acement block on top of the upper bed with a sledgehammer. If thecement block were replaced with a smaller brick, would thedemonstration be more or less safe?
1.As a rocket rises its acceleration increases. Why does thishappen? (assume that the acceleration due to gravity and airresistance are nearly constant during the ascent)
2. If the head of the hammer is loose, and you wish tighten it bybaging it against the top of a work benchm why si it bettwee tohold it with the handle down ( as indicated in the diagram to theright) than to hold with the head down?
3. If a four-engine jet accelerate down a runway at 2.0m/s^2 andone of its engines suddenly fails, how much acceleration will theramaining three produce? ( asuume that all four engines areidentical.)
4. If an elephant was chasing you, its enourmous mass would be mostthreatning, but if made a quick turn, its mass would be to youradvantage. Why?
5. Many automobile passengers waiting at traffic lights havesuffered nech injuries when their cars were struck from behind.Explain why this happens, how can head rests reduce the severity ofthis type of injury?
6. Some people used to think that a spaceship could not maneuverover it left the earths's atmosphere because it would have no airto push against, obiviously, this thinking must be wrong sincerocket engines have been used to steer vehicles through space sincethe late 1950s. how does a rocket engine manage to apply a force toa spaceship in the vacuum of outer space?
7. If a bicycle and a truck have a head-on collision, which vehicleexperiences the greater force? which undergoes the greateraccleration?
8.two closed containers look the same, but one is tightly packedwith lead and the other loosely packed with feathers. how could youdetermine which was which if you and the containers were weightlessin outer space?
9. Two teams are involved in a tug-of-war. why is it wrong to saythat the team that pulls the hardest wins? what force realllydetermines who wins?
10. The photo on the website shows a physics teacher sandwichebetween two bed of nails. A second physics teacher is pulverizing acement block on top of the upper bed with a sledgehammer. If thecement block were replaced with a smaller brick, would thedemonstration be more or less safe?
