Question

below is a list of items. which of these items would still work without air pressure? (select more than one)
□ flashlight
□ helicopter
□ baseball and bat
□ drinking straw
□ parachute
□ magnet
□ vacuum cleaner
□ squirt gun

Explanation:

• Flashlight: Works via electrical energy to produce light, no air pressure needed.
• Baseball and bat: Interaction is mechanical (force transfer), independent of air pressure.
• Magnet: Relies on magnetic forces, not air pressure.
• Helicopter: Needs air pressure (lift from rotor - air interaction), so no.
• Drinking straw: Works by pressure difference (air pressure outside, vacuum inside), needs air pressure, so no.
• Parachute: Depends on air resistance (related to air pressure) to slow descent, needs air pressure, so no.
• Vacuum cleaner: Works by pressure difference (low pressure inside, atmospheric pressure outside to push dirt), needs air pressure, so no.
• Squirt gun: Operates by pressure from squeezing (but also relies on air pressure in some cases, and without air pressure, the fluid dynamics would be different; actually, a squirt gun can work in a vacuum? Wait, no, a squirt gun works by creating pressure on the fluid, but if there's no air pressure, the fluid would still be forced out if you squeeze, but maybe the question is about air - dependent mechanisms. Wait, re - evaluating: Flashlight (electrical, no air), Baseball and bat (mechanical impact, no air), Magnet (magnetic, no air). Let's confirm each:
• Flashlight: Converts electrical energy to light, no air involved.
• Helicopter: Rotors push air down to get lift (Bernoulli or Newton's third law, both air - dependent), so needs air pressure.
• Baseball and bat: When bat hits ball, it's a mechanical force, air pressure not needed for the impact (though air resistance affects ball's flight, but the question is "still work" – if we consider the basic hit, maybe it still "works" to hit the ball, even if flight is different. But maybe the intended answer is that the interaction of bat and ball (the hitting) doesn't need air pressure.
• Drinking straw: You suck, creating low pressure in mouth, atmospheric pressure pushes liquid up – needs air pressure.
• Parachute: Air resistance (air pushing against parachute) slows it down – needs air pressure.
• Magnet: Attracts magnetic materials, no air needed.
• Vacuum cleaner: Creates low pressure, atmospheric pressure pushes dirt in – needs air pressure.
• Squirt gun: If you squeeze, you create pressure on the liquid, but in a vacuum, would it work? Maybe, but the operation of a squirt gun often involves air (like the air bubble in some), but a simple squirt gun (like a syringe - like) would work by pressure from squeezing, regardless of air pressure. But maybe the question's intended items are those that don't rely on air pressure at all. So Flashlight, Baseball and bat, Magnet. Wait, maybe I made a mistake with squirt gun. Let's check standard answers for this type of question: Typically, the items that work without air pressure are Flashlight (electrical), Baseball and bat (mechanical), Magnet (magnetic). So the correct ones are Flashlight, Baseball and bat, Magnet.

Answer:

Flashlight, Baseball and bat, Magnet